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Finding the Fourth Proportional to 103,428.80, 155,143.20 and 73,248.20

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Solution

The fourth proportional to 103,428.80, 155,143.20 and 73,248.20 is: 109,872.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,428.80 : 155,143.20 = 73,248.20 : x
  2. Step 2: Convert to fraction form
    103,428.80/155,143.20 = 73,248.20/x
  3. Step 3: Cross multiply
    103,428.80x = 155,143.20 × 73,248.20
  4. Step 4: Simplify right side
    103,428.80x = 11,363,960,142.24
  5. Step 5: Solve for x
    x = 11,363,960,142.24/103,428.80
  6. Step 6: Final answer
    x = 109,872.30

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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.