Home / 428,962.25-643,427.22-129,434.87

Finding the Fourth Proportional to 428,962.25, 643,427.22 and 129,434.87

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Solution

The fourth proportional to 428,962.25, 643,427.22 and 129,434.87 is: 194,147.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,962.25 : 643,427.22 = 129,434.87 : x
  2. Step 2: Convert to fraction form
    428,962.25/643,427.22 = 129,434.87/x
  3. Step 3: Cross multiply
    428,962.25x = 643,427.22 × 129,434.87
  4. Step 4: Simplify right side
    428,962.25x = 83,281,918,575.16
  5. Step 5: Solve for x
    x = 83,281,918,575.16/428,962.25
  6. Step 6: Final answer
    x = 194,147.43

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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.