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Finding the Fourth Proportional to 81,017.32, 111,811.62 and 49,178.92

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Solution

The fourth proportional to 81,017.32, 111,811.62 and 49,178.92 is: 67,871.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,017.32 : 111,811.62 = 49,178.92 : x
  2. Step 2: Convert to fraction form
    81,017.32/111,811.62 = 49,178.92/x
  3. Step 3: Cross multiply
    81,017.32x = 111,811.62 × 49,178.92
  4. Step 4: Simplify right side
    81,017.32x = 5,498,774,715.05
  5. Step 5: Solve for x
    x = 5,498,774,715.05/81,017.32
  6. Step 6: Final answer
    x = 67,871.59

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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.