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Finding the Fourth Proportional to 20,981.88, 28,959.92 and 12,029.22

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Solution

The fourth proportional to 20,981.88, 28,959.92 and 12,029.22 is: 16,603.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.88 : 28,959.92 = 12,029.22 : x
  2. Step 2: Convert to fraction form
    20,981.88/28,959.92 = 12,029.22/x
  3. Step 3: Cross multiply
    20,981.88x = 28,959.92 × 12,029.22
  4. Step 4: Simplify right side
    20,981.88x = 348,365,248.86
  5. Step 5: Solve for x
    x = 348,365,248.86/20,981.88
  6. Step 6: Final answer
    x = 16,603.15

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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.