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Finding the Fourth Proportional to 1,125.60, 1,687.76 and 693.08

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Solution

The fourth proportional to 1,125.60, 1,687.76 and 693.08 is: 1,039.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.60 : 1,687.76 = 693.08 : x
  2. Step 2: Convert to fraction form
    1,125.60/1,687.76 = 693.08/x
  3. Step 3: Cross multiply
    1,125.60x = 1,687.76 × 693.08
  4. Step 4: Simplify right side
    1,125.60x = 1,169,752.70
  5. Step 5: Solve for x
    x = 1,169,752.70/1,125.60
  6. Step 6: Final answer
    x = 1,039.23

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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.