Home / 428,221.16-642,342.20-143,915.88

Finding the Fourth Proportional to 428,221.16, 642,342.20 and 143,915.88

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Solution

The fourth proportional to 428,221.16, 642,342.20 and 143,915.88 is: 215,877.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,221.16 : 642,342.20 = 143,915.88 : x
  2. Step 2: Convert to fraction form
    428,221.16/642,342.20 = 143,915.88/x
  3. Step 3: Cross multiply
    428,221.16x = 642,342.20 × 143,915.88
  4. Step 4: Simplify right side
    428,221.16x = 92,443,242,974.14
  5. Step 5: Solve for x
    x = 92,443,242,974.14/428,221.16
  6. Step 6: Final answer
    x = 215,877.34

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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.