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Finding the Fourth Proportional to 1,239.28, 1,859.52 and 545.86

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Solution

The fourth proportional to 1,239.28, 1,859.52 and 545.86 is: 819.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.28 : 1,859.52 = 545.86 : x
  2. Step 2: Convert to fraction form
    1,239.28/1,859.52 = 545.86/x
  3. Step 3: Cross multiply
    1,239.28x = 1,859.52 × 545.86
  4. Step 4: Simplify right side
    1,239.28x = 1,015,025.56
  5. Step 5: Solve for x
    x = 1,015,025.56/1,239.28
  6. Step 6: Final answer
    x = 819.05

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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.