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Finding the Fourth Proportional to 81,876.40, 122,879.40 and 31,980.40

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Solution

The fourth proportional to 81,876.40, 122,879.40 and 31,980.40 is: 47,995.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,876.40 : 122,879.40 = 31,980.40 : x
  2. Step 2: Convert to fraction form
    81,876.40/122,879.40 = 31,980.40/x
  3. Step 3: Cross multiply
    81,876.40x = 122,879.40 × 31,980.40
  4. Step 4: Simplify right side
    81,876.40x = 3,929,732,363.76
  5. Step 5: Solve for x
    x = 3,929,732,363.76/81,876.40
  6. Step 6: Final answer
    x = 47,995.91

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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.