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Finding the Fourth Proportional to 66,387.60, 99,435.60 and 57,639.60

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Solution

The fourth proportional to 66,387.60, 99,435.60 and 57,639.60 is: 86,332.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,387.60 : 99,435.60 = 57,639.60 : x
  2. Step 2: Convert to fraction form
    66,387.60/99,435.60 = 57,639.60/x
  3. Step 3: Cross multiply
    66,387.60x = 99,435.60 × 57,639.60
  4. Step 4: Simplify right side
    66,387.60x = 5,731,428,209.76
  5. Step 5: Solve for x
    x = 5,731,428,209.76/66,387.60
  6. Step 6: Final answer
    x = 86,332.81

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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.