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Finding the Fourth Proportional to 519,712.80, 779,860.80 and 220,142.40

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Solution

The fourth proportional to 519,712.80, 779,860.80 and 220,142.40 is: 330,337.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,712.80 : 779,860.80 = 220,142.40 : x
  2. Step 2: Convert to fraction form
    519,712.80/779,860.80 = 220,142.40/x
  3. Step 3: Cross multiply
    519,712.80x = 779,860.80 × 220,142.40
  4. Step 4: Simplify right side
    519,712.80x = 171,680,428,177.92
  5. Step 5: Solve for x
    x = 171,680,428,177.92/519,712.80
  6. Step 6: Final answer
    x = 330,337.12

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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.