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Finding the Fourth Proportional to 726.54, 1,087.08 and 432.96

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Solution

The fourth proportional to 726.54, 1,087.08 and 432.96 is: 647.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.54 : 1,087.08 = 432.96 : x
  2. Step 2: Convert to fraction form
    726.54/1,087.08 = 432.96/x
  3. Step 3: Cross multiply
    726.54x = 1,087.08 × 432.96
  4. Step 4: Simplify right side
    726.54x = 470,662.16
  5. Step 5: Solve for x
    x = 470,662.16/726.54
  6. Step 6: Final answer
    x = 647.81

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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.