Home / 129,704.51-178,965-78,744.08

Finding the Fourth Proportional to 129,704.51, 178,965 and 78,744.08

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Solution

The fourth proportional to 129,704.51, 178,965 and 78,744.08 is: 108,650.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,704.51 : 178,965 = 78,744.08 : x
  2. Step 2: Convert to fraction form
    129,704.51/178,965 = 78,744.08/x
  3. Step 3: Cross multiply
    129,704.51x = 178,965 × 78,744.08
  4. Step 4: Simplify right side
    129,704.51x = 14,092,434,724.61
  5. Step 5: Solve for x
    x = 14,092,434,724.61/129,704.51
  6. Step 6: Final answer
    x = 108,650.30

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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.