Home / 129,391.80-178,571.63-72,814.11

Finding the Fourth Proportional to 129,391.80, 178,571.63 and 72,814.11

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Solution

The fourth proportional to 129,391.80, 178,571.63 and 72,814.11 is: 100,489.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,391.80 : 178,571.63 = 72,814.11 : x
  2. Step 2: Convert to fraction form
    129,391.80/178,571.63 = 72,814.11/x
  3. Step 3: Cross multiply
    129,391.80x = 178,571.63 × 72,814.11
  4. Step 4: Simplify right side
    129,391.80x = 13,002,534,816.81
  5. Step 5: Solve for x
    x = 13,002,534,816.81/129,391.80
  6. Step 6: Final answer
    x = 100,489.63

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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.