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Finding the Fourth Proportional to 19,761.74, 29,642.61 and 7,920.88

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Solution

The fourth proportional to 19,761.74, 29,642.61 and 7,920.88 is: 11,881.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,761.74 : 29,642.61 = 7,920.88 : x
  2. Step 2: Convert to fraction form
    19,761.74/29,642.61 = 7,920.88/x
  3. Step 3: Cross multiply
    19,761.74x = 29,642.61 × 7,920.88
  4. Step 4: Simplify right side
    19,761.74x = 234,795,556.70
  5. Step 5: Solve for x
    x = 234,795,556.70/19,761.74
  6. Step 6: Final answer
    x = 11,881.32

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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.