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Finding the Fourth Proportional to 425.16, 638.04 and 242.40

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Solution

The fourth proportional to 425.16, 638.04 and 242.40 is: 363.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.16 : 638.04 = 242.40 : x
  2. Step 2: Convert to fraction form
    425.16/638.04 = 242.40/x
  3. Step 3: Cross multiply
    425.16x = 638.04 × 242.40
  4. Step 4: Simplify right side
    425.16x = 154,660.90
  5. Step 5: Solve for x
    x = 154,660.90/425.16
  6. Step 6: Final answer
    x = 363.77

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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.