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Finding the Fourth Proportional to 905.55, 1,248.86 and 718.74

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Solution

The fourth proportional to 905.55, 1,248.86 and 718.74 is: 991.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.55 : 1,248.86 = 718.74 : x
  2. Step 2: Convert to fraction form
    905.55/1,248.86 = 718.74/x
  3. Step 3: Cross multiply
    905.55x = 1,248.86 × 718.74
  4. Step 4: Simplify right side
    905.55x = 897,607.43
  5. Step 5: Solve for x
    x = 897,607.43/905.55
  6. Step 6: Final answer
    x = 991.23

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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.