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Finding the Fourth Proportional to 121,356.90, 181,970.55 and 51,156.90

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Solution

The fourth proportional to 121,356.90, 181,970.55 and 51,156.90 is: 76,708.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,356.90 : 181,970.55 = 51,156.90 : x
  2. Step 2: Convert to fraction form
    121,356.90/181,970.55 = 51,156.90/x
  3. Step 3: Cross multiply
    121,356.90x = 181,970.55 × 51,156.90
  4. Step 4: Simplify right side
    121,356.90x = 9,309,049,229.30
  5. Step 5: Solve for x
    x = 9,309,049,229.30/121,356.90
  6. Step 6: Final answer
    x = 76,708.03

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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.