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Finding the Fourth Proportional to 1,553.17, 2,329.80 and 687.55

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Solution

The fourth proportional to 1,553.17, 2,329.80 and 687.55 is: 1,031.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,553.17 : 2,329.80 = 687.55 : x
  2. Step 2: Convert to fraction form
    1,553.17/2,329.80 = 687.55/x
  3. Step 3: Cross multiply
    1,553.17x = 2,329.80 × 687.55
  4. Step 4: Simplify right side
    1,553.17x = 1,601,853.99
  5. Step 5: Solve for x
    x = 1,601,853.99/1,553.17
  6. Step 6: Final answer
    x = 1,031.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.