Home / 428,255.78-642,442.64-143,968.38

Finding the Fourth Proportional to 428,255.78, 642,442.64 and 143,968.38

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Solution

The fourth proportional to 428,255.78, 642,442.64 and 143,968.38 is: 215,972.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,255.78 : 642,442.64 = 143,968.38 : x
  2. Step 2: Convert to fraction form
    428,255.78/642,442.64 = 143,968.38/x
  3. Step 3: Cross multiply
    428,255.78x = 642,442.64 × 143,968.38
  4. Step 4: Simplify right side
    428,255.78x = 92,491,426,123.72
  5. Step 5: Solve for x
    x = 92,491,426,123.72/428,255.78
  6. Step 6: Final answer
    x = 215,972.39

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1.5x scale

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.