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Finding the Fourth Proportional to 137,978.55, 206,803.80 and 123,872.40

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Solution

The fourth proportional to 137,978.55, 206,803.80 and 123,872.40 is: 185,661.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,978.55 : 206,803.80 = 123,872.40 : x
  2. Step 2: Convert to fraction form
    137,978.55/206,803.80 = 123,872.40/x
  3. Step 3: Cross multiply
    137,978.55x = 206,803.80 × 123,872.40
  4. Step 4: Simplify right side
    137,978.55x = 25,617,283,035.12
  5. Step 5: Solve for x
    x = 25,617,283,035.12/137,978.55
  6. Step 6: Final answer
    x = 185,661.34

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.