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Finding the Fourth Proportional to 520,139.52, 780,129.60 and 165,107.52

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Solution

The fourth proportional to 520,139.52, 780,129.60 and 165,107.52 is: 247,635.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,139.52 : 780,129.60 = 165,107.52 : x
  2. Step 2: Convert to fraction form
    520,139.52/780,129.60 = 165,107.52/x
  3. Step 3: Cross multiply
    520,139.52x = 780,129.60 × 165,107.52
  4. Step 4: Simplify right side
    520,139.52x = 128,805,263,534.59
  5. Step 5: Solve for x
    x = 128,805,263,534.59/520,139.52
  6. Step 6: Final answer
    x = 247,635.99

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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.