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Finding the Fourth Proportional to 987.58, 1,362.89 and 545.45

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Solution

The fourth proportional to 987.58, 1,362.89 and 545.45 is: 752.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.58 : 1,362.89 = 545.45 : x
  2. Step 2: Convert to fraction form
    987.58/1,362.89 = 545.45/x
  3. Step 3: Cross multiply
    987.58x = 1,362.89 × 545.45
  4. Step 4: Simplify right side
    987.58x = 743,388.35
  5. Step 5: Solve for x
    x = 743,388.35/987.58
  6. Step 6: Final answer
    x = 752.74

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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.