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Finding the Fourth Proportional to 81,127.63, 121,691.53 and 21,156.06

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Solution

The fourth proportional to 81,127.63, 121,691.53 and 21,156.06 is: 31,734.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,127.63 : 121,691.53 = 21,156.06 : x
  2. Step 2: Convert to fraction form
    81,127.63/121,691.53 = 21,156.06/x
  3. Step 3: Cross multiply
    81,127.63x = 121,691.53 × 21,156.06
  4. Step 4: Simplify right side
    81,127.63x = 2,574,513,450.70
  5. Step 5: Solve for x
    x = 2,574,513,450.70/81,127.63
  6. Step 6: Final answer
    x = 31,734.11

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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.