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Finding the Fourth Proportional to 987.17, 1,481 and 293.81

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Solution

The fourth proportional to 987.17, 1,481 and 293.81 is: 440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.17 : 1,481 = 293.81 : x
  2. Step 2: Convert to fraction form
    987.17/1,481 = 293.81/x
  3. Step 3: Cross multiply
    987.17x = 1,481 × 293.81
  4. Step 4: Simplify right side
    987.17x = 435,132.61
  5. Step 5: Solve for x
    x = 435,132.61/987.17
  6. Step 6: Final answer
    x = 440.79

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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.