Home / 21,071.20-29,079.10-12,118.70

Finding the Fourth Proportional to 21,071.20, 29,079.10 and 12,118.70

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Solution

The fourth proportional to 21,071.20, 29,079.10 and 12,118.70 is: 16,724.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,071.20 : 29,079.10 = 12,118.70 : x
  2. Step 2: Convert to fraction form
    21,071.20/29,079.10 = 12,118.70/x
  3. Step 3: Cross multiply
    21,071.20x = 29,079.10 × 12,118.70
  4. Step 4: Simplify right side
    21,071.20x = 352,400,889.17
  5. Step 5: Solve for x
    x = 352,400,889.17/21,071.20
  6. Step 6: Final answer
    x = 16,724.29

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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.