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Finding the Fourth Proportional to 726.52, 1,089.78 and 178.70

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Solution

The fourth proportional to 726.52, 1,089.78 and 178.70 is: 268.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.52 : 1,089.78 = 178.70 : x
  2. Step 2: Convert to fraction form
    726.52/1,089.78 = 178.70/x
  3. Step 3: Cross multiply
    726.52x = 1,089.78 × 178.70
  4. Step 4: Simplify right side
    726.52x = 194,742.79
  5. Step 5: Solve for x
    x = 194,742.79/726.52
  6. Step 6: Final answer
    x = 268.05

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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.