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Finding the Fourth Proportional to 726.45, 1,002.56 and 415.95

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Solution

The fourth proportional to 726.45, 1,002.56 and 415.95 is: 574.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.45 : 1,002.56 = 415.95 : x
  2. Step 2: Convert to fraction form
    726.45/1,002.56 = 415.95/x
  3. Step 3: Cross multiply
    726.45x = 1,002.56 × 415.95
  4. Step 4: Simplify right side
    726.45x = 417,014.83
  5. Step 5: Solve for x
    x = 417,014.83/726.45
  6. Step 6: Final answer
    x = 574.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.