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Finding the Fourth Proportional to 987.48, 1,481.28 and 554.40

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Solution

The fourth proportional to 987.48, 1,481.28 and 554.40 is: 831.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.48 : 1,481.28 = 554.40 : x
  2. Step 2: Convert to fraction form
    987.48/1,481.28 = 554.40/x
  3. Step 3: Cross multiply
    987.48x = 1,481.28 × 554.40
  4. Step 4: Simplify right side
    987.48x = 821,221.63
  5. Step 5: Solve for x
    x = 821,221.63/987.48
  6. Step 6: Final answer
    x = 831.63

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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.