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Finding the Fourth Proportional to 21,008.60, 31,512.90 and 12,139.10

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Solution

The fourth proportional to 21,008.60, 31,512.90 and 12,139.10 is: 18,208.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.60 : 31,512.90 = 12,139.10 : x
  2. Step 2: Convert to fraction form
    21,008.60/31,512.90 = 12,139.10/x
  3. Step 3: Cross multiply
    21,008.60x = 31,512.90 × 12,139.10
  4. Step 4: Simplify right side
    21,008.60x = 382,538,244.39
  5. Step 5: Solve for x
    x = 382,538,244.39/21,008.60
  6. Step 6: Final answer
    x = 18,208.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.