Home / 81,355.08-121,706.82-70,379.76

Finding the Fourth Proportional to 81,355.08, 121,706.82 and 70,379.76

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Solution

The fourth proportional to 81,355.08, 121,706.82 and 70,379.76 is: 105,287.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,355.08 : 121,706.82 = 70,379.76 : x
  2. Step 2: Convert to fraction form
    81,355.08/121,706.82 = 70,379.76/x
  3. Step 3: Cross multiply
    81,355.08x = 121,706.82 × 70,379.76
  4. Step 4: Simplify right side
    81,355.08x = 8,565,696,781.96
  5. Step 5: Solve for x
    x = 8,565,696,781.96/81,355.08
  6. Step 6: Final answer
    x = 105,287.79

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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.