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Finding the Fourth Proportional to 926.80, 1,279.01 and 507.18

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Solution

The fourth proportional to 926.80, 1,279.01 and 507.18 is: 699.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.80 : 1,279.01 = 507.18 : x
  2. Step 2: Convert to fraction form
    926.80/1,279.01 = 507.18/x
  3. Step 3: Cross multiply
    926.80x = 1,279.01 × 507.18
  4. Step 4: Simplify right side
    926.80x = 648,691.50
  5. Step 5: Solve for x
    x = 648,691.50/926.80
  6. Step 6: Final answer
    x = 699.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.