Home / 20,981.84-28,954.76-11,908.92

Finding the Fourth Proportional to 20,981.84, 28,954.76 and 11,908.92

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Solution

The fourth proportional to 20,981.84, 28,954.76 and 11,908.92 is: 16,434.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.84 : 28,954.76 = 11,908.92 : x
  2. Step 2: Convert to fraction form
    20,981.84/28,954.76 = 11,908.92/x
  3. Step 3: Cross multiply
    20,981.84x = 28,954.76 × 11,908.92
  4. Step 4: Simplify right side
    20,981.84x = 344,819,920.46
  5. Step 5: Solve for x
    x = 344,819,920.46/20,981.84
  6. Step 6: Final answer
    x = 16,434.21

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Half scale
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Double scale
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Similar ratio
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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.