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Finding the Fourth Proportional to 78,350.70, 107,974.17 and 76,911.06

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Solution

The fourth proportional to 78,350.70, 107,974.17 and 76,911.06 is: 105,990.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,350.70 : 107,974.17 = 76,911.06 : x
  2. Step 2: Convert to fraction form
    78,350.70/107,974.17 = 76,911.06/x
  3. Step 3: Cross multiply
    78,350.70x = 107,974.17 × 76,911.06
  4. Step 4: Simplify right side
    78,350.70x = 8,304,407,867.32
  5. Step 5: Solve for x
    x = 8,304,407,867.32/78,350.70
  6. Step 6: Final answer
    x = 105,990.22

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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.