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Finding the Fourth Proportional to 212,857.71, 318,925.25 and 128,440.49

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Solution

The fourth proportional to 212,857.71, 318,925.25 and 128,440.49 is: 192,442.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,857.71 : 318,925.25 = 128,440.49 : x
  2. Step 2: Convert to fraction form
    212,857.71/318,925.25 = 128,440.49/x
  3. Step 3: Cross multiply
    212,857.71x = 318,925.25 × 128,440.49
  4. Step 4: Simplify right side
    212,857.71x = 40,962,913,628.20
  5. Step 5: Solve for x
    x = 40,962,913,628.20/212,857.71
  6. Step 6: Final answer
    x = 192,442.71

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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.