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Finding the Fourth Proportional to 987.62, 1,481.58 and 371.40

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Solution

The fourth proportional to 987.62, 1,481.58 and 371.40 is: 557.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.62 : 1,481.58 = 371.40 : x
  2. Step 2: Convert to fraction form
    987.62/1,481.58 = 371.40/x
  3. Step 3: Cross multiply
    987.62x = 1,481.58 × 371.40
  4. Step 4: Simplify right side
    987.62x = 550,258.81
  5. Step 5: Solve for x
    x = 550,258.81/987.62
  6. Step 6: Final answer
    x = 557.16

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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.