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Finding the Fourth Proportional to 154,326.78, 212,979.24 and 86,339.70

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Solution

The fourth proportional to 154,326.78, 212,979.24 and 86,339.70 is: 119,153.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,326.78 : 212,979.24 = 86,339.70 : x
  2. Step 2: Convert to fraction form
    154,326.78/212,979.24 = 86,339.70/x
  3. Step 3: Cross multiply
    154,326.78x = 212,979.24 × 86,339.70
  4. Step 4: Simplify right side
    154,326.78x = 18,388,563,687.83
  5. Step 5: Solve for x
    x = 18,388,563,687.83/154,326.78
  6. Step 6: Final answer
    x = 119,153.42

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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.