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Finding the Fourth Proportional to 121,181.10, 181,750.05 and 76,728.30

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Solution

The fourth proportional to 121,181.10, 181,750.05 and 76,728.30 is: 115,078.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,181.10 : 181,750.05 = 76,728.30 : x
  2. Step 2: Convert to fraction form
    121,181.10/181,750.05 = 76,728.30/x
  3. Step 3: Cross multiply
    121,181.10x = 181,750.05 × 76,728.30
  4. Step 4: Simplify right side
    121,181.10x = 13,945,372,361.42
  5. Step 5: Solve for x
    x = 13,945,372,361.42/121,181.10
  6. Step 6: Final answer
    x = 115,078.77

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1.5x scale

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.