Home / 129,070.50-178,040.07-81,240.81

Finding the Fourth Proportional to 129,070.50, 178,040.07 and 81,240.81

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Solution

The fourth proportional to 129,070.50, 178,040.07 and 81,240.81 is: 112,063.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,070.50 : 178,040.07 = 81,240.81 : x
  2. Step 2: Convert to fraction form
    129,070.50/178,040.07 = 81,240.81/x
  3. Step 3: Cross multiply
    129,070.50x = 178,040.07 × 81,240.81
  4. Step 4: Simplify right side
    129,070.50x = 14,464,119,499.26
  5. Step 5: Solve for x
    x = 14,464,119,499.26/129,070.50
  6. Step 6: Final answer
    x = 112,063.71

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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.