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Finding the Fourth Proportional to 129,072.50, 178,042.82 and 81,242.82

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Solution

The fourth proportional to 129,072.50, 178,042.82 and 81,242.82 is: 112,066.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,072.50 : 178,042.82 = 81,242.82 : x
  2. Step 2: Convert to fraction form
    129,072.50/178,042.82 = 81,242.82/x
  3. Step 3: Cross multiply
    129,072.50x = 178,042.82 × 81,242.82
  4. Step 4: Simplify right side
    129,072.50x = 14,464,700,777.55
  5. Step 5: Solve for x
    x = 14,464,700,777.55/129,072.50
  6. Step 6: Final answer
    x = 112,066.48

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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.