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Finding the Fourth Proportional to 1,387.10, 2,079.95 and 509.43

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Solution

The fourth proportional to 1,387.10, 2,079.95 and 509.43 is: 763.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.10 : 2,079.95 = 509.43 : x
  2. Step 2: Convert to fraction form
    1,387.10/2,079.95 = 509.43/x
  3. Step 3: Cross multiply
    1,387.10x = 2,079.95 × 509.43
  4. Step 4: Simplify right side
    1,387.10x = 1,059,590.20
  5. Step 5: Solve for x
    x = 1,059,590.20/1,387.10
  6. Step 6: Final answer
    x = 763.89

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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.