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Finding the Fourth Proportional to 8,457.77, 11,672.54 and 4,920.75

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Solution

The fourth proportional to 8,457.77, 11,672.54 and 4,920.75 is: 6,791.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,457.77 : 11,672.54 = 4,920.75 : x
  2. Step 2: Convert to fraction form
    8,457.77/11,672.54 = 4,920.75/x
  3. Step 3: Cross multiply
    8,457.77x = 11,672.54 × 4,920.75
  4. Step 4: Simplify right side
    8,457.77x = 57,437,665.81
  5. Step 5: Solve for x
    x = 57,437,665.81/8,457.77
  6. Step 6: Final answer
    x = 6,791.11

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.