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Finding the Fourth Proportional to 817.74, 1,221.30 and 708.39

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Solution

The fourth proportional to 817.74, 1,221.30 and 708.39 is: 1,057.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.74 : 1,221.30 = 708.39 : x
  2. Step 2: Convert to fraction form
    817.74/1,221.30 = 708.39/x
  3. Step 3: Cross multiply
    817.74x = 1,221.30 × 708.39
  4. Step 4: Simplify right side
    817.74x = 865,156.71
  5. Step 5: Solve for x
    x = 865,156.71/817.74
  6. Step 6: Final answer
    x = 1,057.99

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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.