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Finding the Fourth Proportional to 218,368.40, 327,725.40 and 85,312.40

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Solution

The fourth proportional to 218,368.40, 327,725.40 and 85,312.40 is: 128,036.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,368.40 : 327,725.40 = 85,312.40 : x
  2. Step 2: Convert to fraction form
    218,368.40/327,725.40 = 85,312.40/x
  3. Step 3: Cross multiply
    218,368.40x = 327,725.40 × 85,312.40
  4. Step 4: Simplify right side
    218,368.40x = 27,959,040,414.96
  5. Step 5: Solve for x
    x = 27,959,040,414.96/218,368.40
  6. Step 6: Final answer
    x = 128,036.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.