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Finding the Fourth Proportional to 987, 1,480.50 and 554.19

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Solution

The fourth proportional to 987, 1,480.50 and 554.19 is: 831.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,480.50 = 554.19 : x
  2. Step 2: Convert to fraction form
    987/1,480.50 = 554.19/x
  3. Step 3: Cross multiply
    987x = 1,480.50 × 554.19
  4. Step 4: Simplify right side
    987x = 820,478.30
  5. Step 5: Solve for x
    x = 820,478.30/987
  6. Step 6: Final answer
    x = 831.29

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Similar ratio
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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.