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Finding the Fourth Proportional to 66,488.40, 99,732.60 and 65,905.20

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Solution

The fourth proportional to 66,488.40, 99,732.60 and 65,905.20 is: 98,857.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,488.40 : 99,732.60 = 65,905.20 : x
  2. Step 2: Convert to fraction form
    66,488.40/99,732.60 = 65,905.20/x
  3. Step 3: Cross multiply
    66,488.40x = 99,732.60 × 65,905.20
  4. Step 4: Simplify right side
    66,488.40x = 6,572,896,949.52
  5. Step 5: Solve for x
    x = 6,572,896,949.52/66,488.40
  6. Step 6: Final answer
    x = 98,857.80

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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.