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Finding the Fourth Proportional to 666.80, 999.48 and 392.48

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Solution

The fourth proportional to 666.80, 999.48 and 392.48 is: 588.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.80 : 999.48 = 392.48 : x
  2. Step 2: Convert to fraction form
    666.80/999.48 = 392.48/x
  3. Step 3: Cross multiply
    666.80x = 999.48 × 392.48
  4. Step 4: Simplify right side
    666.80x = 392,275.91
  5. Step 5: Solve for x
    x = 392,275.91/666.80
  6. Step 6: Final answer
    x = 588.30

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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.