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Finding the Fourth Proportional to 621.52, 931.25 and 438.54

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Solution

The fourth proportional to 621.52, 931.25 and 438.54 is: 657.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.52 : 931.25 = 438.54 : x
  2. Step 2: Convert to fraction form
    621.52/931.25 = 438.54/x
  3. Step 3: Cross multiply
    621.52x = 931.25 × 438.54
  4. Step 4: Simplify right side
    621.52x = 408,390.38
  5. Step 5: Solve for x
    x = 408,390.38/621.52
  6. Step 6: Final answer
    x = 657.08

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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.