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Finding the Fourth Proportional to 129,894, 179,253.72 and 70,278

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Solution

The fourth proportional to 129,894, 179,253.72 and 70,278 is: 96,983.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,894 : 179,253.72 = 70,278 : x
  2. Step 2: Convert to fraction form
    129,894/179,253.72 = 70,278/x
  3. Step 3: Cross multiply
    129,894x = 179,253.72 × 70,278
  4. Step 4: Simplify right side
    129,894x = 12,597,592,934.16
  5. Step 5: Solve for x
    x = 12,597,592,934.16/129,894
  6. Step 6: Final answer
    x = 96,983.64

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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.