Home / 81,129.54-112,531.58-78,971.70

Finding the Fourth Proportional to 81,129.54, 112,531.58 and 78,971.70

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Solution

The fourth proportional to 81,129.54, 112,531.58 and 78,971.70 is: 109,538.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,129.54 : 112,531.58 = 78,971.70 : x
  2. Step 2: Convert to fraction form
    81,129.54/112,531.58 = 78,971.70/x
  3. Step 3: Cross multiply
    81,129.54x = 112,531.58 × 78,971.70
  4. Step 4: Simplify right side
    81,129.54x = 8,886,809,781.43
  5. Step 5: Solve for x
    x = 8,886,809,781.43/81,129.54
  6. Step 6: Final answer
    x = 109,538.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.