Home / 121,781.96-167,964-78,178.76

Finding the Fourth Proportional to 121,781.96, 167,964 and 78,178.76

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Solution

The fourth proportional to 121,781.96, 167,964 and 78,178.76 is: 107,825.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,781.96 : 167,964 = 78,178.76 : x
  2. Step 2: Convert to fraction form
    121,781.96/167,964 = 78,178.76/x
  3. Step 3: Cross multiply
    121,781.96x = 167,964 × 78,178.76
  4. Step 4: Simplify right side
    121,781.96x = 13,131,217,244.64
  5. Step 5: Solve for x
    x = 13,131,217,244.64/121,781.96
  6. Step 6: Final answer
    x = 107,825.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.