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Finding the Fourth Proportional to 1,247.93, 1,869.76 and 698.75

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Solution

The fourth proportional to 1,247.93, 1,869.76 and 698.75 is: 1,046.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.93 : 1,869.76 = 698.75 : x
  2. Step 2: Convert to fraction form
    1,247.93/1,869.76 = 698.75/x
  3. Step 3: Cross multiply
    1,247.93x = 1,869.76 × 698.75
  4. Step 4: Simplify right side
    1,247.93x = 1,306,494.80
  5. Step 5: Solve for x
    x = 1,306,494.80/1,247.93
  6. Step 6: Final answer
    x = 1,046.93

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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.