Home / 428,915.37-643,377.69-129,398.57

Finding the Fourth Proportional to 428,915.37, 643,377.69 and 129,398.57

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Solution

The fourth proportional to 428,915.37, 643,377.69 and 129,398.57 is: 194,099.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,915.37 : 643,377.69 = 129,398.57 : x
  2. Step 2: Convert to fraction form
    428,915.37/643,377.69 = 129,398.57/x
  3. Step 3: Cross multiply
    428,915.37x = 643,377.69 × 129,398.57
  4. Step 4: Simplify right side
    428,915.37x = 83,252,149,839.01
  5. Step 5: Solve for x
    x = 83,252,149,839.01/428,915.37
  6. Step 6: Final answer
    x = 194,099.25

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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.