Home / 81,169.20-121,753.80-72,356.40

Finding the Fourth Proportional to 81,169.20, 121,753.80 and 72,356.40

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Solution

The fourth proportional to 81,169.20, 121,753.80 and 72,356.40 is: 108,534.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,169.20 : 121,753.80 = 72,356.40 : x
  2. Step 2: Convert to fraction form
    81,169.20/121,753.80 = 72,356.40/x
  3. Step 3: Cross multiply
    81,169.20x = 121,753.80 × 72,356.40
  4. Step 4: Simplify right side
    81,169.20x = 8,809,666,654.32
  5. Step 5: Solve for x
    x = 8,809,666,654.32/81,169.20
  6. Step 6: Final answer
    x = 108,534.60

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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.