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Finding the Fourth Proportional to 66,439.80, 99,659.70 and 38,359.80

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Solution

The fourth proportional to 66,439.80, 99,659.70 and 38,359.80 is: 57,539.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,439.80 : 99,659.70 = 38,359.80 : x
  2. Step 2: Convert to fraction form
    66,439.80/99,659.70 = 38,359.80/x
  3. Step 3: Cross multiply
    66,439.80x = 99,659.70 × 38,359.80
  4. Step 4: Simplify right side
    66,439.80x = 3,822,926,160.06
  5. Step 5: Solve for x
    x = 3,822,926,160.06/66,439.80
  6. Step 6: Final answer
    x = 57,539.70

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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.