Home / 428,928.18-643,396.94-129,411.44

Finding the Fourth Proportional to 428,928.18, 643,396.94 and 129,411.44

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Solution

The fourth proportional to 428,928.18, 643,396.94 and 129,411.44 is: 194,118.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,928.18 : 643,396.94 = 129,411.44 : x
  2. Step 2: Convert to fraction form
    428,928.18/643,396.94 = 129,411.44/x
  3. Step 3: Cross multiply
    428,928.18x = 643,396.94 × 129,411.44
  4. Step 4: Simplify right side
    428,928.18x = 83,262,924,496.99
  5. Step 5: Solve for x
    x = 83,262,924,496.99/428,928.18
  6. Step 6: Final answer
    x = 194,118.57

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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.