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Finding the Fourth Proportional to 78,251.84, 108,029.38 and 61,219.88

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Solution

The fourth proportional to 78,251.84, 108,029.38 and 61,219.88 is: 84,516.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,251.84 : 108,029.38 = 61,219.88 : x
  2. Step 2: Convert to fraction form
    78,251.84/108,029.38 = 61,219.88/x
  3. Step 3: Cross multiply
    78,251.84x = 108,029.38 × 61,219.88
  4. Step 4: Simplify right side
    78,251.84x = 6,613,545,680.07
  5. Step 5: Solve for x
    x = 6,613,545,680.07/78,251.84
  6. Step 6: Final answer
    x = 84,516.17

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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.