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Finding the Fourth Proportional to 217,643.87, 300,377.85 and 122,155.79

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Solution

The fourth proportional to 217,643.87, 300,377.85 and 122,155.79 is: 168,591.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,643.87 : 300,377.85 = 122,155.79 : x
  2. Step 2: Convert to fraction form
    217,643.87/300,377.85 = 122,155.79/x
  3. Step 3: Cross multiply
    217,643.87x = 300,377.85 × 122,155.79
  4. Step 4: Simplify right side
    217,643.87x = 36,692,893,565.25
  5. Step 5: Solve for x
    x = 36,692,893,565.25/217,643.87
  6. Step 6: Final answer
    x = 168,591.44

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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.