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Finding the Fourth Proportional to 987.27, 1,362.39 and 545.10

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Solution

The fourth proportional to 987.27, 1,362.39 and 545.10 is: 752.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.27 : 1,362.39 = 545.10 : x
  2. Step 2: Convert to fraction form
    987.27/1,362.39 = 545.10/x
  3. Step 3: Cross multiply
    987.27x = 1,362.39 × 545.10
  4. Step 4: Simplify right side
    987.27x = 742,638.79
  5. Step 5: Solve for x
    x = 742,638.79/987.27
  6. Step 6: Final answer
    x = 752.21

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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.