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Finding the Fourth Proportional to 987.61, 1,362.91 and 545.59

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Solution

The fourth proportional to 987.61, 1,362.91 and 545.59 is: 752.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.61 : 1,362.91 = 545.59 : x
  2. Step 2: Convert to fraction form
    987.61/1,362.91 = 545.59/x
  3. Step 3: Cross multiply
    987.61x = 1,362.91 × 545.59
  4. Step 4: Simplify right side
    987.61x = 743,581.89
  5. Step 5: Solve for x
    x = 743,581.89/987.61
  6. Step 6: Final answer
    x = 752.91

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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.