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Finding the Fourth Proportional to 926.93, 1,279.11 and 507.20

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Solution

The fourth proportional to 926.93, 1,279.11 and 507.20 is: 699.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.93 : 1,279.11 = 507.20 : x
  2. Step 2: Convert to fraction form
    926.93/1,279.11 = 507.20/x
  3. Step 3: Cross multiply
    926.93x = 1,279.11 × 507.20
  4. Step 4: Simplify right side
    926.93x = 648,765.86
  5. Step 5: Solve for x
    x = 648,765.86/926.93
  6. Step 6: Final answer
    x = 699.91

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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.