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Finding the Fourth Proportional to 927.96, 1,391.92 and 545.64

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Solution

The fourth proportional to 927.96, 1,391.92 and 545.64 is: 818.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.96 : 1,391.92 = 545.64 : x
  2. Step 2: Convert to fraction form
    927.96/1,391.92 = 545.64/x
  3. Step 3: Cross multiply
    927.96x = 1,391.92 × 545.64
  4. Step 4: Simplify right side
    927.96x = 759,487.23
  5. Step 5: Solve for x
    x = 759,487.23/927.96
  6. Step 6: Final answer
    x = 818.45

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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.