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Finding the Fourth Proportional to 485.52, 726.45 and 280.18

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Solution

The fourth proportional to 485.52, 726.45 and 280.18 is: 419.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.52 : 726.45 = 280.18 : x
  2. Step 2: Convert to fraction form
    485.52/726.45 = 280.18/x
  3. Step 3: Cross multiply
    485.52x = 726.45 × 280.18
  4. Step 4: Simplify right side
    485.52x = 203,536.76
  5. Step 5: Solve for x
    x = 203,536.76/485.52
  6. Step 6: Final answer
    x = 419.21

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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.