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Finding the Fourth Proportional to 308,931.30, 426,361.11 and 188,143.38

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Solution

The fourth proportional to 308,931.30, 426,361.11 and 188,143.38 is: 259,659.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,931.30 : 426,361.11 = 188,143.38 : x
  2. Step 2: Convert to fraction form
    308,931.30/426,361.11 = 188,143.38/x
  3. Step 3: Cross multiply
    308,931.30x = 426,361.11 × 188,143.38
  4. Step 4: Simplify right side
    308,931.30x = 80,217,020,335.95
  5. Step 5: Solve for x
    x = 80,217,020,335.95/308,931.30
  6. Step 6: Final answer
    x = 259,659.74

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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.