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Finding the Fourth Proportional to 153,940.64, 212,436 and 85,958.78

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Solution

The fourth proportional to 153,940.64, 212,436 and 85,958.78 is: 118,621.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,940.64 : 212,436 = 85,958.78 : x
  2. Step 2: Convert to fraction form
    153,940.64/212,436 = 85,958.78/x
  3. Step 3: Cross multiply
    153,940.64x = 212,436 × 85,958.78
  4. Step 4: Simplify right side
    153,940.64x = 18,260,738,325.90
  5. Step 5: Solve for x
    x = 18,260,738,325.90/153,940.64
  6. Step 6: Final answer
    x = 118,621.95

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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.