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Finding the Fourth Proportional to 937.30, 1,405.68 and 279.15

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Solution

The fourth proportional to 937.30, 1,405.68 and 279.15 is: 418.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    937.30 : 1,405.68 = 279.15 : x
  2. Step 2: Convert to fraction form
    937.30/1,405.68 = 279.15/x
  3. Step 3: Cross multiply
    937.30x = 1,405.68 × 279.15
  4. Step 4: Simplify right side
    937.30x = 392,394.16
  5. Step 5: Solve for x
    x = 392,394.16/937.30
  6. Step 6: Final answer
    x = 418.64

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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.