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Finding the Fourth Proportional to 10,488.80, 15,729.10 and 3,911.40

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Solution

The fourth proportional to 10,488.80, 15,729.10 and 3,911.40 is: 5,865.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,488.80 : 15,729.10 = 3,911.40 : x
  2. Step 2: Convert to fraction form
    10,488.80/15,729.10 = 3,911.40/x
  3. Step 3: Cross multiply
    10,488.80x = 15,729.10 × 3,911.40
  4. Step 4: Simplify right side
    10,488.80x = 61,522,791.96
  5. Step 5: Solve for x
    x = 61,522,791.96/10,488.80
  6. Step 6: Final answer
    x = 5,865.57

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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.