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Finding the Fourth Proportional to 425.40, 638.13 and 117.30

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Solution

The fourth proportional to 425.40, 638.13 and 117.30 is: 175.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.40 : 638.13 = 117.30 : x
  2. Step 2: Convert to fraction form
    425.40/638.13 = 117.30/x
  3. Step 3: Cross multiply
    425.40x = 638.13 × 117.30
  4. Step 4: Simplify right side
    425.40x = 74,851.23
  5. Step 5: Solve for x
    x = 74,851.23/425.40
  6. Step 6: Final answer
    x = 175.95

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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.