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Finding the Fourth Proportional to 425.61, 638.15 and 206.16

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Solution

The fourth proportional to 425.61, 638.15 and 206.16 is: 309.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.61 : 638.15 = 206.16 : x
  2. Step 2: Convert to fraction form
    425.61/638.15 = 206.16/x
  3. Step 3: Cross multiply
    425.61x = 638.15 × 206.16
  4. Step 4: Simplify right side
    425.61x = 131,559.97
  5. Step 5: Solve for x
    x = 131,559.97/425.61
  6. Step 6: Final answer
    x = 309.11

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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.