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Finding the Fourth Proportional to 918.88, 1,372.80 and 726.64

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Solution

The fourth proportional to 918.88, 1,372.80 and 726.64 is: 1,085.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.88 : 1,372.80 = 726.64 : x
  2. Step 2: Convert to fraction form
    918.88/1,372.80 = 726.64/x
  3. Step 3: Cross multiply
    918.88x = 1,372.80 × 726.64
  4. Step 4: Simplify right side
    918.88x = 997,531.39
  5. Step 5: Solve for x
    x = 997,531.39/918.88
  6. Step 6: Final answer
    x = 1,085.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.