Home / 428,256.78-642,444.14-143,969.38

Finding the Fourth Proportional to 428,256.78, 642,444.14 and 143,969.38

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Solution

The fourth proportional to 428,256.78, 642,444.14 and 143,969.38 is: 215,973.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,256.78 : 642,444.14 = 143,969.38 : x
  2. Step 2: Convert to fraction form
    428,256.78/642,444.14 = 143,969.38/x
  3. Step 3: Cross multiply
    428,256.78x = 642,444.14 × 143,969.38
  4. Step 4: Simplify right side
    428,256.78x = 92,492,284,520.43
  5. Step 5: Solve for x
    x = 92,492,284,520.43/428,256.78
  6. Step 6: Final answer
    x = 215,973.89

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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.