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Finding the Fourth Proportional to 817.63, 1,125.76 and 721.71

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Solution

The fourth proportional to 817.63, 1,125.76 and 721.71 is: 993.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.63 : 1,125.76 = 721.71 : x
  2. Step 2: Convert to fraction form
    817.63/1,125.76 = 721.71/x
  3. Step 3: Cross multiply
    817.63x = 1,125.76 × 721.71
  4. Step 4: Simplify right side
    817.63x = 812,468.64
  5. Step 5: Solve for x
    x = 812,468.64/817.63
  6. Step 6: Final answer
    x = 993.69

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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.