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Finding the Fourth Proportional to 666.55, 999.25 and 432.39

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Solution

The fourth proportional to 666.55, 999.25 and 432.39 is: 648.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.55 : 999.25 = 432.39 : x
  2. Step 2: Convert to fraction form
    666.55/999.25 = 432.39/x
  3. Step 3: Cross multiply
    666.55x = 999.25 × 432.39
  4. Step 4: Simplify right side
    666.55x = 432,064.63
  5. Step 5: Solve for x
    x = 432,064.63/666.55
  6. Step 6: Final answer
    x = 648.21

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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.