Home / 129,117.28-178,170.96-78,806.56

Finding the Fourth Proportional to 129,117.28, 178,170.96 and 78,806.56

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Solution

The fourth proportional to 129,117.28, 178,170.96 and 78,806.56 is: 108,746.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,117.28 : 178,170.96 = 78,806.56 : x
  2. Step 2: Convert to fraction form
    129,117.28/178,170.96 = 78,806.56/x
  3. Step 3: Cross multiply
    129,117.28x = 178,170.96 × 78,806.56
  4. Step 4: Simplify right side
    129,117.28x = 14,041,040,449.50
  5. Step 5: Solve for x
    x = 14,041,040,449.50/129,117.28
  6. Step 6: Final answer
    x = 108,746.41

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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.