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Finding the Fourth Proportional to 425.07, 585.37 and 398.70

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Solution

The fourth proportional to 425.07, 585.37 and 398.70 is: 549.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.07 : 585.37 = 398.70 : x
  2. Step 2: Convert to fraction form
    425.07/585.37 = 398.70/x
  3. Step 3: Cross multiply
    425.07x = 585.37 × 398.70
  4. Step 4: Simplify right side
    425.07x = 233,387.52
  5. Step 5: Solve for x
    x = 233,387.52/425.07
  6. Step 6: Final answer
    x = 549.06

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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.