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Finding the Fourth Proportional to 386,288.80, 579,433.20 and 253,246.30

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Solution

The fourth proportional to 386,288.80, 579,433.20 and 253,246.30 is: 379,869.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,288.80 : 579,433.20 = 253,246.30 : x
  2. Step 2: Convert to fraction form
    386,288.80/579,433.20 = 253,246.30/x
  3. Step 3: Cross multiply
    386,288.80x = 579,433.20 × 253,246.30
  4. Step 4: Simplify right side
    386,288.80x = 146,739,313,997.16
  5. Step 5: Solve for x
    x = 146,739,313,997.16/386,288.80
  6. Step 6: Final answer
    x = 379,869.45

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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.