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Finding the Fourth Proportional to 987.67, 1,363.04 and 545.55

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Solution

The fourth proportional to 987.67, 1,363.04 and 545.55 is: 752.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.67 : 1,363.04 = 545.55 : x
  2. Step 2: Convert to fraction form
    987.67/1,363.04 = 545.55/x
  3. Step 3: Cross multiply
    987.67x = 1,363.04 × 545.55
  4. Step 4: Simplify right side
    987.67x = 743,606.47
  5. Step 5: Solve for x
    x = 743,606.47/987.67
  6. Step 6: Final answer
    x = 752.89

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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.