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Finding the Fourth Proportional to 959.28, 1,323.78 and 545.28

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Solution

The fourth proportional to 959.28, 1,323.78 and 545.28 is: 752.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.28 : 1,323.78 = 545.28 : x
  2. Step 2: Convert to fraction form
    959.28/1,323.78 = 545.28/x
  3. Step 3: Cross multiply
    959.28x = 1,323.78 × 545.28
  4. Step 4: Simplify right side
    959.28x = 721,830.76
  5. Step 5: Solve for x
    x = 721,830.76/959.28
  6. Step 6: Final answer
    x = 752.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.