Home / 21,507.12-29,678.86-11,947.66

Finding the Fourth Proportional to 21,507.12, 29,678.86 and 11,947.66

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Solution

The fourth proportional to 21,507.12, 29,678.86 and 11,947.66 is: 16,487.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,507.12 : 29,678.86 = 11,947.66 : x
  2. Step 2: Convert to fraction form
    21,507.12/29,678.86 = 11,947.66/x
  3. Step 3: Cross multiply
    21,507.12x = 29,678.86 × 11,947.66
  4. Step 4: Simplify right side
    21,507.12x = 354,592,928.47
  5. Step 5: Solve for x
    x = 354,592,928.47/21,507.12
  6. Step 6: Final answer
    x = 16,487.23

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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.