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Finding the Fourth Proportional to 68,011.20, 102,016.80 and 21,278.40

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Solution

The fourth proportional to 68,011.20, 102,016.80 and 21,278.40 is: 31,917.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,011.20 : 102,016.80 = 21,278.40 : x
  2. Step 2: Convert to fraction form
    68,011.20/102,016.80 = 21,278.40/x
  3. Step 3: Cross multiply
    68,011.20x = 102,016.80 × 21,278.40
  4. Step 4: Simplify right side
    68,011.20x = 2,170,754,277.12
  5. Step 5: Solve for x
    x = 2,170,754,277.12/68,011.20
  6. Step 6: Final answer
    x = 31,917.60

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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.