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Finding the Fourth Proportional to 402.72, 602.88 and 287.04

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Solution

The fourth proportional to 402.72, 602.88 and 287.04 is: 429.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.72 : 602.88 = 287.04 : x
  2. Step 2: Convert to fraction form
    402.72/602.88 = 287.04/x
  3. Step 3: Cross multiply
    402.72x = 602.88 × 287.04
  4. Step 4: Simplify right side
    402.72x = 173,050.68
  5. Step 5: Solve for x
    x = 173,050.68/402.72
  6. Step 6: Final answer
    x = 429.70

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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.