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Finding the Fourth Proportional to 100,945.80, 151,418.70 and 81,262.80

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Solution

The fourth proportional to 100,945.80, 151,418.70 and 81,262.80 is: 121,894.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,945.80 : 151,418.70 = 81,262.80 : x
  2. Step 2: Convert to fraction form
    100,945.80/151,418.70 = 81,262.80/x
  3. Step 3: Cross multiply
    100,945.80x = 151,418.70 × 81,262.80
  4. Step 4: Simplify right side
    100,945.80x = 12,304,707,534.36
  5. Step 5: Solve for x
    x = 12,304,707,534.36/100,945.80
  6. Step 6: Final answer
    x = 121,894.20

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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.