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Finding the Fourth Proportional to 987.06, 1,480.80 and 548.52

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Solution

The fourth proportional to 987.06, 1,480.80 and 548.52 is: 822.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.06 : 1,480.80 = 548.52 : x
  2. Step 2: Convert to fraction form
    987.06/1,480.80 = 548.52/x
  3. Step 3: Cross multiply
    987.06x = 1,480.80 × 548.52
  4. Step 4: Simplify right side
    987.06x = 812,248.42
  5. Step 5: Solve for x
    x = 812,248.42/987.06
  6. Step 6: Final answer
    x = 822.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.