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Finding the Fourth Proportional to 20,881.54, 28,817.70 and 12,388.70

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Solution

The fourth proportional to 20,881.54, 28,817.70 and 12,388.70 is: 17,097.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.54 : 28,817.70 = 12,388.70 : x
  2. Step 2: Convert to fraction form
    20,881.54/28,817.70 = 12,388.70/x
  3. Step 3: Cross multiply
    20,881.54x = 28,817.70 × 12,388.70
  4. Step 4: Simplify right side
    20,881.54x = 357,013,839.99
  5. Step 5: Solve for x
    x = 357,013,839.99/20,881.54
  6. Step 6: Final answer
    x = 17,097.10

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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.