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Finding the Fourth Proportional to 129,791.78, 179,112.29 and 72,430.49

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Solution

The fourth proportional to 129,791.78, 179,112.29 and 72,430.49 is: 99,953.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,791.78 : 179,112.29 = 72,430.49 : x
  2. Step 2: Convert to fraction form
    129,791.78/179,112.29 = 72,430.49/x
  3. Step 3: Cross multiply
    129,791.78x = 179,112.29 × 72,430.49
  4. Step 4: Simplify right side
    129,791.78x = 12,973,189,672.01
  5. Step 5: Solve for x
    x = 12,973,189,672.01/129,791.78
  6. Step 6: Final answer
    x = 99,953.87

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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.