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Finding the Fourth Proportional to 930.32, 1,398.72 and 643.04

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Solution

The fourth proportional to 930.32, 1,398.72 and 643.04 is: 966.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.32 : 1,398.72 = 643.04 : x
  2. Step 2: Convert to fraction form
    930.32/1,398.72 = 643.04/x
  3. Step 3: Cross multiply
    930.32x = 1,398.72 × 643.04
  4. Step 4: Simplify right side
    930.32x = 899,432.91
  5. Step 5: Solve for x
    x = 899,432.91/930.32
  6. Step 6: Final answer
    x = 966.80

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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.