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Finding the Fourth Proportional to 987.22, 1,362.36 and 545.13

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Solution

The fourth proportional to 987.22, 1,362.36 and 545.13 is: 752.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.22 : 1,362.36 = 545.13 : x
  2. Step 2: Convert to fraction form
    987.22/1,362.36 = 545.13/x
  3. Step 3: Cross multiply
    987.22x = 1,362.36 × 545.13
  4. Step 4: Simplify right side
    987.22x = 742,665.35
  5. Step 5: Solve for x
    x = 742,665.35/987.22
  6. Step 6: Final answer
    x = 752.28

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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.