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Finding the Fourth Proportional to 103,940.40, 155,691.90 and 86,444.40

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Solution

The fourth proportional to 103,940.40, 155,691.90 and 86,444.40 is: 129,484.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,940.40 : 155,691.90 = 86,444.40 : x
  2. Step 2: Convert to fraction form
    103,940.40/155,691.90 = 86,444.40/x
  3. Step 3: Cross multiply
    103,940.40x = 155,691.90 × 86,444.40
  4. Step 4: Simplify right side
    103,940.40x = 13,458,692,880.36
  5. Step 5: Solve for x
    x = 13,458,692,880.36/103,940.40
  6. Step 6: Final answer
    x = 129,484.71

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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.