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Finding the Fourth Proportional to 842.80, 1,162.72 and 527.91

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Solution

The fourth proportional to 842.80, 1,162.72 and 527.91 is: 728.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.80 : 1,162.72 = 527.91 : x
  2. Step 2: Convert to fraction form
    842.80/1,162.72 = 527.91/x
  3. Step 3: Cross multiply
    842.80x = 1,162.72 × 527.91
  4. Step 4: Simplify right side
    842.80x = 613,811.52
  5. Step 5: Solve for x
    x = 613,811.52/842.80
  6. Step 6: Final answer
    x = 728.30

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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.