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Finding the Fourth Proportional to 929.91, 1,394.79 and 280.65

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Solution

The fourth proportional to 929.91, 1,394.79 and 280.65 is: 420.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.91 : 1,394.79 = 280.65 : x
  2. Step 2: Convert to fraction form
    929.91/1,394.79 = 280.65/x
  3. Step 3: Cross multiply
    929.91x = 1,394.79 × 280.65
  4. Step 4: Simplify right side
    929.91x = 391,447.81
  5. Step 5: Solve for x
    x = 391,447.81/929.91
  6. Step 6: Final answer
    x = 420.95

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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.