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Finding the Fourth Proportional to 987.79, 1,481.64 and 371.45

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Solution

The fourth proportional to 987.79, 1,481.64 and 371.45 is: 557.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.79 : 1,481.64 = 371.45 : x
  2. Step 2: Convert to fraction form
    987.79/1,481.64 = 371.45/x
  3. Step 3: Cross multiply
    987.79x = 1,481.64 × 371.45
  4. Step 4: Simplify right side
    987.79x = 550,351.47
  5. Step 5: Solve for x
    x = 550,351.47/987.79
  6. Step 6: Final answer
    x = 557.15

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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.