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Finding the Fourth Proportional to 987.61, 1,362.89 and 545.50

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Solution

The fourth proportional to 987.61, 1,362.89 and 545.50 is: 752.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.61 : 1,362.89 = 545.50 : x
  2. Step 2: Convert to fraction form
    987.61/1,362.89 = 545.50/x
  3. Step 3: Cross multiply
    987.61x = 1,362.89 × 545.50
  4. Step 4: Simplify right side
    987.61x = 743,453.77
  5. Step 5: Solve for x
    x = 743,453.77/987.61
  6. Step 6: Final answer
    x = 752.78

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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.