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Finding the Fourth Proportional to 1,687.05, 2,529.49 and 712.89

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Solution

The fourth proportional to 1,687.05, 2,529.49 and 712.89 is: 1,068.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.05 : 2,529.49 = 712.89 : x
  2. Step 2: Convert to fraction form
    1,687.05/2,529.49 = 712.89/x
  3. Step 3: Cross multiply
    1,687.05x = 2,529.49 × 712.89
  4. Step 4: Simplify right side
    1,687.05x = 1,803,248.13
  5. Step 5: Solve for x
    x = 1,803,248.13/1,687.05
  6. Step 6: Final answer
    x = 1,068.88

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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.