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Finding the Fourth Proportional to 726.23, 1,088.72 and 287.79

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Solution

The fourth proportional to 726.23, 1,088.72 and 287.79 is: 431.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.23 : 1,088.72 = 287.79 : x
  2. Step 2: Convert to fraction form
    726.23/1,088.72 = 287.79/x
  3. Step 3: Cross multiply
    726.23x = 1,088.72 × 287.79
  4. Step 4: Simplify right side
    726.23x = 313,319.50
  5. Step 5: Solve for x
    x = 313,319.50/726.23
  6. Step 6: Final answer
    x = 431.43

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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.