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Finding the Fourth Proportional to 1,118.91, 1,678.85 and 425.79

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Solution

The fourth proportional to 1,118.91, 1,678.85 and 425.79 is: 638.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.91 : 1,678.85 = 425.79 : x
  2. Step 2: Convert to fraction form
    1,118.91/1,678.85 = 425.79/x
  3. Step 3: Cross multiply
    1,118.91x = 1,678.85 × 425.79
  4. Step 4: Simplify right side
    1,118.91x = 714,838.61
  5. Step 5: Solve for x
    x = 714,838.61/1,118.91
  6. Step 6: Final answer
    x = 638.87

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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.