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Finding the Fourth Proportional to 66,520.32, 91,799.12 and 39,678.54

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Solution

The fourth proportional to 66,520.32, 91,799.12 and 39,678.54 is: 54,757.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,520.32 : 91,799.12 = 39,678.54 : x
  2. Step 2: Convert to fraction form
    66,520.32/91,799.12 = 39,678.54/x
  3. Step 3: Cross multiply
    66,520.32x = 91,799.12 × 39,678.54
  4. Step 4: Simplify right side
    66,520.32x = 3,642,454,856.49
  5. Step 5: Solve for x
    x = 3,642,454,856.49/66,520.32
  6. Step 6: Final answer
    x = 54,757.03

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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.