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Finding the Fourth Proportional to 15,471.42, 21,339.99 and 9,879.90

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Solution

The fourth proportional to 15,471.42, 21,339.99 and 9,879.90 is: 13,627.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,471.42 : 21,339.99 = 9,879.90 : x
  2. Step 2: Convert to fraction form
    15,471.42/21,339.99 = 9,879.90/x
  3. Step 3: Cross multiply
    15,471.42x = 21,339.99 × 9,879.90
  4. Step 4: Simplify right side
    15,471.42x = 210,836,967.20
  5. Step 5: Solve for x
    x = 210,836,967.20/15,471.42
  6. Step 6: Final answer
    x = 13,627.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.