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Finding the Fourth Proportional to 987.82, 1,363.20 and 545.76

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Solution

The fourth proportional to 987.82, 1,363.20 and 545.76 is: 753.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.82 : 1,363.20 = 545.76 : x
  2. Step 2: Convert to fraction form
    987.82/1,363.20 = 545.76/x
  3. Step 3: Cross multiply
    987.82x = 1,363.20 × 545.76
  4. Step 4: Simplify right side
    987.82x = 743,986.42
  5. Step 5: Solve for x
    x = 743,986.42/987.82
  6. Step 6: Final answer
    x = 753.16

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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.