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Finding the Fourth Proportional to 80,971.79, 111,656.29 and 69,679.58

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Solution

The fourth proportional to 80,971.79, 111,656.29 and 69,679.58 is: 96,084.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,971.79 : 111,656.29 = 69,679.58 : x
  2. Step 2: Convert to fraction form
    80,971.79/111,656.29 = 69,679.58/x
  3. Step 3: Cross multiply
    80,971.79x = 111,656.29 × 69,679.58
  4. Step 4: Simplify right side
    80,971.79x = 7,780,163,043.16
  5. Step 5: Solve for x
    x = 7,780,163,043.16/80,971.79
  6. Step 6: Final answer
    x = 96,084.86

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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.