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Finding the Fourth Proportional to 15,868.80, 23,796.72 and 5,479.20

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Solution

The fourth proportional to 15,868.80, 23,796.72 and 5,479.20 is: 8,216.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,868.80 : 23,796.72 = 5,479.20 : x
  2. Step 2: Convert to fraction form
    15,868.80/23,796.72 = 5,479.20/x
  3. Step 3: Cross multiply
    15,868.80x = 23,796.72 × 5,479.20
  4. Step 4: Simplify right side
    15,868.80x = 130,386,988.22
  5. Step 5: Solve for x
    x = 130,386,988.22/15,868.80
  6. Step 6: Final answer
    x = 8,216.56

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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.