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Finding the Fourth Proportional to 19,761.48, 29,642.22 and 7,920.63

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Solution

The fourth proportional to 19,761.48, 29,642.22 and 7,920.63 is: 11,880.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,761.48 : 29,642.22 = 7,920.63 : x
  2. Step 2: Convert to fraction form
    19,761.48/29,642.22 = 7,920.63/x
  3. Step 3: Cross multiply
    19,761.48x = 29,642.22 × 7,920.63
  4. Step 4: Simplify right side
    19,761.48x = 234,785,057.00
  5. Step 5: Solve for x
    x = 234,785,057.00/19,761.48
  6. Step 6: Final answer
    x = 11,880.95

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.