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Finding the Fourth Proportional to 66,785.31, 100,154.90 and 19,387.55

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Solution

The fourth proportional to 66,785.31, 100,154.90 and 19,387.55 is: 29,074.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,785.31 : 100,154.90 = 19,387.55 : x
  2. Step 2: Convert to fraction form
    66,785.31/100,154.90 = 19,387.55/x
  3. Step 3: Cross multiply
    66,785.31x = 100,154.90 × 19,387.55
  4. Step 4: Simplify right side
    66,785.31x = 1,941,757,533.78
  5. Step 5: Solve for x
    x = 1,941,757,533.78/66,785.31
  6. Step 6: Final answer
    x = 29,074.62

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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.