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Finding the Fourth Proportional to 8,678.79, 11,979.14 and 5,143.95

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Solution

The fourth proportional to 8,678.79, 11,979.14 and 5,143.95 is: 7,100.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,678.79 : 11,979.14 = 5,143.95 : x
  2. Step 2: Convert to fraction form
    8,678.79/11,979.14 = 5,143.95/x
  3. Step 3: Cross multiply
    8,678.79x = 11,979.14 × 5,143.95
  4. Step 4: Simplify right side
    8,678.79x = 61,620,071.48
  5. Step 5: Solve for x
    x = 61,620,071.48/8,678.79
  6. Step 6: Final answer
    x = 7,100.08

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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.