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Finding the Fourth Proportional to 154,334.57, 212,971.68 and 86,339.79

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Solution

The fourth proportional to 154,334.57, 212,971.68 and 86,339.79 is: 119,143.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,334.57 : 212,971.68 = 86,339.79 : x
  2. Step 2: Convert to fraction form
    154,334.57/212,971.68 = 86,339.79/x
  3. Step 3: Cross multiply
    154,334.57x = 212,971.68 × 86,339.79
  4. Step 4: Simplify right side
    154,334.57x = 18,387,930,127.15
  5. Step 5: Solve for x
    x = 18,387,930,127.15/154,334.57
  6. Step 6: Final answer
    x = 119,143.30

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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.