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Finding the Fourth Proportional to 929.91, 1,395.08 and 280.70

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Solution

The fourth proportional to 929.91, 1,395.08 and 280.70 is: 421.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.91 : 1,395.08 = 280.70 : x
  2. Step 2: Convert to fraction form
    929.91/1,395.08 = 280.70/x
  3. Step 3: Cross multiply
    929.91x = 1,395.08 × 280.70
  4. Step 4: Simplify right side
    929.91x = 391,590.58
  5. Step 5: Solve for x
    x = 391,590.58/929.91
  6. Step 6: Final answer
    x = 421.11

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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.