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Finding the Fourth Proportional to 912.74, 1,369.56 and 425.70

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Solution

The fourth proportional to 912.74, 1,369.56 and 425.70 is: 638.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.74 : 1,369.56 = 425.70 : x
  2. Step 2: Convert to fraction form
    912.74/1,369.56 = 425.70/x
  3. Step 3: Cross multiply
    912.74x = 1,369.56 × 425.70
  4. Step 4: Simplify right side
    912.74x = 583,021.69
  5. Step 5: Solve for x
    x = 583,021.69/912.74
  6. Step 6: Final answer
    x = 638.76

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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.