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Finding the Fourth Proportional to 987.41, 1,360.30 and 818.73

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Solution

The fourth proportional to 987.41, 1,360.30 and 818.73 is: 1,127.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.41 : 1,360.30 = 818.73 : x
  2. Step 2: Convert to fraction form
    987.41/1,360.30 = 818.73/x
  3. Step 3: Cross multiply
    987.41x = 1,360.30 × 818.73
  4. Step 4: Simplify right side
    987.41x = 1,113,718.42
  5. Step 5: Solve for x
    x = 1,113,718.42/987.41
  6. Step 6: Final answer
    x = 1,127.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.