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Finding the Fourth Proportional to 212,188.64, 318,060.61 and 85,918.55

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Solution

The fourth proportional to 212,188.64, 318,060.61 and 85,918.55 is: 128,787.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,188.64 : 318,060.61 = 85,918.55 : x
  2. Step 2: Convert to fraction form
    212,188.64/318,060.61 = 85,918.55/x
  3. Step 3: Cross multiply
    212,188.64x = 318,060.61 × 85,918.55
  4. Step 4: Simplify right side
    212,188.64x = 27,327,304,618.22
  5. Step 5: Solve for x
    x = 27,327,304,618.22/212,188.64
  6. Step 6: Final answer
    x = 128,787.79

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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.