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Finding the Fourth Proportional to 666.92, 1,000.72 and 407.46

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Solution

The fourth proportional to 666.92, 1,000.72 and 407.46 is: 611.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 1,000.72 = 407.46 : x
  2. Step 2: Convert to fraction form
    666.92/1,000.72 = 407.46/x
  3. Step 3: Cross multiply
    666.92x = 1,000.72 × 407.46
  4. Step 4: Simplify right side
    666.92x = 407,753.37
  5. Step 5: Solve for x
    x = 407,753.37/666.92
  6. Step 6: Final answer
    x = 611.40

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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.