Home / 81,648.11-122,440.65-31,721.63

Finding the Fourth Proportional to 81,648.11, 122,440.65 and 31,721.63

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Solution

The fourth proportional to 81,648.11, 122,440.65 and 31,721.63 is: 47,570.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,648.11 : 122,440.65 = 31,721.63 : x
  2. Step 2: Convert to fraction form
    81,648.11/122,440.65 = 31,721.63/x
  3. Step 3: Cross multiply
    81,648.11x = 122,440.65 × 31,721.63
  4. Step 4: Simplify right side
    81,648.11x = 3,884,016,996.26
  5. Step 5: Solve for x
    x = 3,884,016,996.26/81,648.11
  6. Step 6: Final answer
    x = 47,570.20

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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.