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Finding the Fourth Proportional to 402.88, 603.06 and 258.70

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Solution

The fourth proportional to 402.88, 603.06 and 258.70 is: 387.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.88 : 603.06 = 258.70 : x
  2. Step 2: Convert to fraction form
    402.88/603.06 = 258.70/x
  3. Step 3: Cross multiply
    402.88x = 603.06 × 258.70
  4. Step 4: Simplify right side
    402.88x = 156,011.62
  5. Step 5: Solve for x
    x = 156,011.62/402.88
  6. Step 6: Final answer
    x = 387.24

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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.