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Finding the Fourth Proportional to 61,140.80, 91,711.20 and 37,812.80

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Solution

The fourth proportional to 61,140.80, 91,711.20 and 37,812.80 is: 56,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,140.80 : 91,711.20 = 37,812.80 : x
  2. Step 2: Convert to fraction form
    61,140.80/91,711.20 = 37,812.80/x
  3. Step 3: Cross multiply
    61,140.80x = 91,711.20 × 37,812.80
  4. Step 4: Simplify right side
    61,140.80x = 3,467,857,263.36
  5. Step 5: Solve for x
    x = 3,467,857,263.36/61,140.80
  6. Step 6: Final answer
    x = 56,719.20

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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.