Home / 21,680.74-29,920-12,249.10

Finding the Fourth Proportional to 21,680.74, 29,920 and 12,249.10

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Solution

The fourth proportional to 21,680.74, 29,920 and 12,249.10 is: 16,904.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,680.74 : 29,920 = 12,249.10 : x
  2. Step 2: Convert to fraction form
    21,680.74/29,920 = 12,249.10/x
  3. Step 3: Cross multiply
    21,680.74x = 29,920 × 12,249.10
  4. Step 4: Simplify right side
    21,680.74x = 366,492,922.40
  5. Step 5: Solve for x
    x = 366,492,922.40/21,680.74
  6. Step 6: Final answer
    x = 16,904.08

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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.