Home / 129,119.28-178,173.72-78,808.56

Finding the Fourth Proportional to 129,119.28, 178,173.72 and 78,808.56

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Solution

The fourth proportional to 129,119.28, 178,173.72 and 78,808.56 is: 108,749.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,119.28 : 178,173.72 = 78,808.56 : x
  2. Step 2: Convert to fraction form
    129,119.28/178,173.72 = 78,808.56/x
  3. Step 3: Cross multiply
    129,119.28x = 178,173.72 × 78,808.56
  4. Step 4: Simplify right side
    129,119.28x = 14,041,614,303.04
  5. Step 5: Solve for x
    x = 14,041,614,303.04/129,119.28
  6. Step 6: Final answer
    x = 108,749.17

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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.