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Finding the Fourth Proportional to 642.07, 963.12 and 425.53

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Solution

The fourth proportional to 642.07, 963.12 and 425.53 is: 638.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.07 : 963.12 = 425.53 : x
  2. Step 2: Convert to fraction form
    642.07/963.12 = 425.53/x
  3. Step 3: Cross multiply
    642.07x = 963.12 × 425.53
  4. Step 4: Simplify right side
    642.07x = 409,831.64
  5. Step 5: Solve for x
    x = 409,831.64/642.07
  6. Step 6: Final answer
    x = 638.30

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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.