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Finding the Fourth Proportional to 77,134.80, 115,809.27 and 39,721.62

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Solution

The fourth proportional to 77,134.80, 115,809.27 and 39,721.62 is: 59,637.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,134.80 : 115,809.27 = 39,721.62 : x
  2. Step 2: Convert to fraction form
    77,134.80/115,809.27 = 39,721.62/x
  3. Step 3: Cross multiply
    77,134.80x = 115,809.27 × 39,721.62
  4. Step 4: Simplify right side
    77,134.80x = 4,600,131,815.42
  5. Step 5: Solve for x
    x = 4,600,131,815.42/77,134.80
  6. Step 6: Final answer
    x = 59,637.57

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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.