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Finding the Fourth Proportional to 109,139.76, 150,611.88 and 61,393.47

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Solution

The fourth proportional to 109,139.76, 150,611.88 and 61,393.47 is: 84,722.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,139.76 : 150,611.88 = 61,393.47 : x
  2. Step 2: Convert to fraction form
    109,139.76/150,611.88 = 61,393.47/x
  3. Step 3: Cross multiply
    109,139.76x = 150,611.88 × 61,393.47
  4. Step 4: Simplify right side
    109,139.76x = 9,246,585,936.42
  5. Step 5: Solve for x
    x = 9,246,585,936.42/109,139.76
  6. Step 6: Final answer
    x = 84,722.43

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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.