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Finding the Fourth Proportional to 78,572.20, 117,728.70 and 66,908.20

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Solution

The fourth proportional to 78,572.20, 117,728.70 and 66,908.20 is: 100,251.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,572.20 : 117,728.70 = 66,908.20 : x
  2. Step 2: Convert to fraction form
    78,572.20/117,728.70 = 66,908.20/x
  3. Step 3: Cross multiply
    78,572.20x = 117,728.70 × 66,908.20
  4. Step 4: Simplify right side
    78,572.20x = 7,877,015,405.34
  5. Step 5: Solve for x
    x = 7,877,015,405.34/78,572.20
  6. Step 6: Final answer
    x = 100,251.94

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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.