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Finding the Fourth Proportional to 342,120, 472,140.18 and 191,217

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Solution

The fourth proportional to 342,120, 472,140.18 and 191,217 is: 263,887.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,120 : 472,140.18 = 191,217 : x
  2. Step 2: Convert to fraction form
    342,120/472,140.18 = 191,217/x
  3. Step 3: Cross multiply
    342,120x = 472,140.18 × 191,217
  4. Step 4: Simplify right side
    342,120x = 90,281,228,799.06
  5. Step 5: Solve for x
    x = 90,281,228,799.06/342,120
  6. Step 6: Final answer
    x = 263,887.61

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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.