Home / 129,785.79-179,104.10-72,421.59

Finding the Fourth Proportional to 129,785.79, 179,104.10 and 72,421.59

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Solution

The fourth proportional to 129,785.79, 179,104.10 and 72,421.59 is: 99,941.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,785.79 : 179,104.10 = 72,421.59 : x
  2. Step 2: Convert to fraction form
    129,785.79/179,104.10 = 72,421.59/x
  3. Step 3: Cross multiply
    129,785.79x = 179,104.10 × 72,421.59
  4. Step 4: Simplify right side
    129,785.79x = 12,971,004,007.05
  5. Step 5: Solve for x
    x = 12,971,004,007.05/129,785.79
  6. Step 6: Final answer
    x = 99,941.63

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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.