Home / 21,378.50-29,502.20-11,947.06

Finding the Fourth Proportional to 21,378.50, 29,502.20 and 11,947.06

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Solution

The fourth proportional to 21,378.50, 29,502.20 and 11,947.06 is: 16,486.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,378.50 : 29,502.20 = 11,947.06 : x
  2. Step 2: Convert to fraction form
    21,378.50/29,502.20 = 11,947.06/x
  3. Step 3: Cross multiply
    21,378.50x = 29,502.20 × 11,947.06
  4. Step 4: Simplify right side
    21,378.50x = 352,464,553.53
  5. Step 5: Solve for x
    x = 352,464,553.53/21,378.50
  6. Step 6: Final answer
    x = 16,486.87

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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.