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Finding the Fourth Proportional to 55,140.80, 82,711.20 and 42,699.20

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Solution

The fourth proportional to 55,140.80, 82,711.20 and 42,699.20 is: 64,048.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,140.80 : 82,711.20 = 42,699.20 : x
  2. Step 2: Convert to fraction form
    55,140.80/82,711.20 = 42,699.20/x
  3. Step 3: Cross multiply
    55,140.80x = 82,711.20 × 42,699.20
  4. Step 4: Simplify right side
    55,140.80x = 3,531,702,071.04
  5. Step 5: Solve for x
    x = 3,531,702,071.04/55,140.80
  6. Step 6: Final answer
    x = 64,048.80

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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.