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Finding the Fourth Proportional to 101,971.80, 152,957.70 and 66,542.40

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Solution

The fourth proportional to 101,971.80, 152,957.70 and 66,542.40 is: 99,813.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,971.80 : 152,957.70 = 66,542.40 : x
  2. Step 2: Convert to fraction form
    101,971.80/152,957.70 = 66,542.40/x
  3. Step 3: Cross multiply
    101,971.80x = 152,957.70 × 66,542.40
  4. Step 4: Simplify right side
    101,971.80x = 10,178,172,456.48
  5. Step 5: Solve for x
    x = 10,178,172,456.48/101,971.80
  6. Step 6: Final answer
    x = 99,813.60

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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.