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Finding the Fourth Proportional to 159,143.10, 219,621.69 and 86,550.90

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Solution

The fourth proportional to 159,143.10, 219,621.69 and 86,550.90 is: 119,442.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,143.10 : 219,621.69 = 86,550.90 : x
  2. Step 2: Convert to fraction form
    159,143.10/219,621.69 = 86,550.90/x
  3. Step 3: Cross multiply
    159,143.10x = 219,621.69 × 86,550.90
  4. Step 4: Simplify right side
    159,143.10x = 19,008,454,929.02
  5. Step 5: Solve for x
    x = 19,008,454,929.02/159,143.10
  6. Step 6: Final answer
    x = 119,442.53

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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.