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Finding the Fourth Proportional to 81,866.90, 122,865.15 and 31,970.90

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Solution

The fourth proportional to 81,866.90, 122,865.15 and 31,970.90 is: 47,981.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,866.90 : 122,865.15 = 31,970.90 : x
  2. Step 2: Convert to fraction form
    81,866.90/122,865.15 = 31,970.90/x
  3. Step 3: Cross multiply
    81,866.90x = 122,865.15 × 31,970.90
  4. Step 4: Simplify right side
    81,866.90x = 3,928,109,424.14
  5. Step 5: Solve for x
    x = 3,928,109,424.14/81,866.90
  6. Step 6: Final answer
    x = 47,981.66

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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.