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Finding the Fourth Proportional to 15,879.95, 21,909.29 and 9,164.69

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Solution

The fourth proportional to 15,879.95, 21,909.29 and 9,164.69 is: 12,644.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.95 : 21,909.29 = 9,164.69 : x
  2. Step 2: Convert to fraction form
    15,879.95/21,909.29 = 9,164.69/x
  3. Step 3: Cross multiply
    15,879.95x = 21,909.29 × 9,164.69
  4. Step 4: Simplify right side
    15,879.95x = 200,791,695.60
  5. Step 5: Solve for x
    x = 200,791,695.60/15,879.95
  6. Step 6: Final answer
    x = 12,644.36

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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.