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Finding the Fourth Proportional to 987.33, 1,362.47 and 545.21

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Solution

The fourth proportional to 987.33, 1,362.47 and 545.21 is: 752.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.33 : 1,362.47 = 545.21 : x
  2. Step 2: Convert to fraction form
    987.33/1,362.47 = 545.21/x
  3. Step 3: Cross multiply
    987.33x = 1,362.47 × 545.21
  4. Step 4: Simplify right side
    987.33x = 742,832.27
  5. Step 5: Solve for x
    x = 742,832.27/987.33
  6. Step 6: Final answer
    x = 752.36

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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.