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Finding the Fourth Proportional to 428,242.40, 642,422.61 and 143,955.03

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Solution

The fourth proportional to 428,242.40, 642,422.61 and 143,955.03 is: 215,952.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,242.40 : 642,422.61 = 143,955.03 : x
  2. Step 2: Convert to fraction form
    428,242.40/642,422.61 = 143,955.03/x
  3. Step 3: Cross multiply
    428,242.40x = 642,422.61 × 143,955.03
  4. Step 4: Simplify right side
    428,242.40x = 92,479,965,555.40
  5. Step 5: Solve for x
    x = 92,479,965,555.40/428,242.40
  6. Step 6: Final answer
    x = 215,952.38

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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.