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Finding the Fourth Proportional to 1,162.72, 1,605.40 and 813.88

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Solution

The fourth proportional to 1,162.72, 1,605.40 and 813.88 is: 1,123.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.72 : 1,605.40 = 813.88 : x
  2. Step 2: Convert to fraction form
    1,162.72/1,605.40 = 813.88/x
  3. Step 3: Cross multiply
    1,162.72x = 1,605.40 × 813.88
  4. Step 4: Simplify right side
    1,162.72x = 1,306,602.95
  5. Step 5: Solve for x
    x = 1,306,602.95/1,162.72
  6. Step 6: Final answer
    x = 1,123.75

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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.