Home / 428,962.64-643,427.78-129,435.23

Finding the Fourth Proportional to 428,962.64, 643,427.78 and 129,435.23

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Solution

The fourth proportional to 428,962.64, 643,427.78 and 129,435.23 is: 194,147.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,962.64 : 643,427.78 = 129,435.23 : x
  2. Step 2: Convert to fraction form
    428,962.64/643,427.78 = 129,435.23/x
  3. Step 3: Cross multiply
    428,962.64x = 643,427.78 × 129,435.23
  4. Step 4: Simplify right side
    428,962.64x = 83,282,222,692.69
  5. Step 5: Solve for x
    x = 83,282,222,692.69/428,962.64
  6. Step 6: Final answer
    x = 194,147.96

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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.