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Finding the Fourth Proportional to 1,171.61, 1,757.42 and 687.74

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Solution

The fourth proportional to 1,171.61, 1,757.42 and 687.74 is: 1,031.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.61 : 1,757.42 = 687.74 : x
  2. Step 2: Convert to fraction form
    1,171.61/1,757.42 = 687.74/x
  3. Step 3: Cross multiply
    1,171.61x = 1,757.42 × 687.74
  4. Step 4: Simplify right side
    1,171.61x = 1,208,635.81
  5. Step 5: Solve for x
    x = 1,208,635.81/1,171.61
  6. Step 6: Final answer
    x = 1,031.60

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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.