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Finding the Fourth Proportional to 425.60, 587.20 and 315.28

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Solution

The fourth proportional to 425.60, 587.20 and 315.28 is: 434.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.60 : 587.20 = 315.28 : x
  2. Step 2: Convert to fraction form
    425.60/587.20 = 315.28/x
  3. Step 3: Cross multiply
    425.60x = 587.20 × 315.28
  4. Step 4: Simplify right side
    425.60x = 185,132.42
  5. Step 5: Solve for x
    x = 185,132.42/425.60
  6. Step 6: Final answer
    x = 434.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.