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Finding the Fourth Proportional to 726.06, 1,089.51 and 287.35

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Solution

The fourth proportional to 726.06, 1,089.51 and 287.35 is: 431.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.06 : 1,089.51 = 287.35 : x
  2. Step 2: Convert to fraction form
    726.06/1,089.51 = 287.35/x
  3. Step 3: Cross multiply
    726.06x = 1,089.51 × 287.35
  4. Step 4: Simplify right side
    726.06x = 313,069.00
  5. Step 5: Solve for x
    x = 313,069.00/726.06
  6. Step 6: Final answer
    x = 431.19

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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.