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Finding the Fourth Proportional to 961.68, 1,436.28 and 815.76

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Solution

The fourth proportional to 961.68, 1,436.28 and 815.76 is: 1,218.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.68 : 1,436.28 = 815.76 : x
  2. Step 2: Convert to fraction form
    961.68/1,436.28 = 815.76/x
  3. Step 3: Cross multiply
    961.68x = 1,436.28 × 815.76
  4. Step 4: Simplify right side
    961.68x = 1,171,659.77
  5. Step 5: Solve for x
    x = 1,171,659.77/961.68
  6. Step 6: Final answer
    x = 1,218.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.