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Finding the Fourth Proportional to 1,215.52, 1,677.16 and 717.82

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Solution

The fourth proportional to 1,215.52, 1,677.16 and 717.82 is: 990.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.52 : 1,677.16 = 717.82 : x
  2. Step 2: Convert to fraction form
    1,215.52/1,677.16 = 717.82/x
  3. Step 3: Cross multiply
    1,215.52x = 1,677.16 × 717.82
  4. Step 4: Simplify right side
    1,215.52x = 1,203,898.99
  5. Step 5: Solve for x
    x = 1,203,898.99/1,215.52
  6. Step 6: Final answer
    x = 990.44

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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.