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Finding the Fourth Proportional to 171,387.40, 256,965.90 and 91,438.60

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Solution

The fourth proportional to 171,387.40, 256,965.90 and 91,438.60 is: 137,096.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,387.40 : 256,965.90 = 91,438.60 : x
  2. Step 2: Convert to fraction form
    171,387.40/256,965.90 = 91,438.60/x
  3. Step 3: Cross multiply
    171,387.40x = 256,965.90 × 91,438.60
  4. Step 4: Simplify right side
    171,387.40x = 23,496,602,143.74
  5. Step 5: Solve for x
    x = 23,496,602,143.74/171,387.40
  6. Step 6: Final answer
    x = 137,096.44

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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.