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Finding the Fourth Proportional to 77,989.53, 107,625.31 and 42,179.54

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Solution

The fourth proportional to 77,989.53, 107,625.31 and 42,179.54 is: 58,207.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,989.53 : 107,625.31 = 42,179.54 : x
  2. Step 2: Convert to fraction form
    77,989.53/107,625.31 = 42,179.54/x
  3. Step 3: Cross multiply
    77,989.53x = 107,625.31 × 42,179.54
  4. Step 4: Simplify right side
    77,989.53x = 4,539,585,424.58
  5. Step 5: Solve for x
    x = 4,539,585,424.58/77,989.53
  6. Step 6: Final answer
    x = 58,207.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.