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Finding the Fourth Proportional to 1,147.76, 1,721.07 and 679.72

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Solution

The fourth proportional to 1,147.76, 1,721.07 and 679.72 is: 1,019.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.76 : 1,721.07 = 679.72 : x
  2. Step 2: Convert to fraction form
    1,147.76/1,721.07 = 679.72/x
  3. Step 3: Cross multiply
    1,147.76x = 1,721.07 × 679.72
  4. Step 4: Simplify right side
    1,147.76x = 1,169,841.40
  5. Step 5: Solve for x
    x = 1,169,841.40/1,147.76
  6. Step 6: Final answer
    x = 1,019.24

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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.