Home / 21,511.28-29,685.75-12,080.72

Finding the Fourth Proportional to 21,511.28, 29,685.75 and 12,080.72

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Solution

The fourth proportional to 21,511.28, 29,685.75 and 12,080.72 is: 16,671.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.28 : 29,685.75 = 12,080.72 : x
  2. Step 2: Convert to fraction form
    21,511.28/29,685.75 = 12,080.72/x
  3. Step 3: Cross multiply
    21,511.28x = 29,685.75 × 12,080.72
  4. Step 4: Simplify right side
    21,511.28x = 358,625,233.74
  5. Step 5: Solve for x
    x = 358,625,233.74/21,511.28
  6. Step 6: Final answer
    x = 16,671.50

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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.