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Finding the Fourth Proportional to 15,917.70, 21,960.46 and 9,865.17

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Solution

The fourth proportional to 15,917.70, 21,960.46 and 9,865.17 is: 13,610.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,917.70 : 21,960.46 = 9,865.17 : x
  2. Step 2: Convert to fraction form
    15,917.70/21,960.46 = 9,865.17/x
  3. Step 3: Cross multiply
    15,917.70x = 21,960.46 × 9,865.17
  4. Step 4: Simplify right side
    15,917.70x = 216,643,765.86
  5. Step 5: Solve for x
    x = 216,643,765.86/15,917.70
  6. Step 6: Final answer
    x = 13,610.25

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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.