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Finding the Fourth Proportional to 66,420.70, 99,631.05 and 59,859.70

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Solution

The fourth proportional to 66,420.70, 99,631.05 and 59,859.70 is: 89,789.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.70 : 99,631.05 = 59,859.70 : x
  2. Step 2: Convert to fraction form
    66,420.70/99,631.05 = 59,859.70/x
  3. Step 3: Cross multiply
    66,420.70x = 99,631.05 × 59,859.70
  4. Step 4: Simplify right side
    66,420.70x = 5,963,884,763.69
  5. Step 5: Solve for x
    x = 5,963,884,763.69/66,420.70
  6. Step 6: Final answer
    x = 89,789.55

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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.