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Finding the Fourth Proportional to 425.90, 639.60 and 358.31

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Solution

The fourth proportional to 425.90, 639.60 and 358.31 is: 538.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.90 : 639.60 = 358.31 : x
  2. Step 2: Convert to fraction form
    425.90/639.60 = 358.31/x
  3. Step 3: Cross multiply
    425.90x = 639.60 × 358.31
  4. Step 4: Simplify right side
    425.90x = 229,175.08
  5. Step 5: Solve for x
    x = 229,175.08/425.90
  6. Step 6: Final answer
    x = 538.10

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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.