Home / 428,938.20-643,411.92-129,421.44

Finding the Fourth Proportional to 428,938.20, 643,411.92 and 129,421.44

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Solution

The fourth proportional to 428,938.20, 643,411.92 and 129,421.44 is: 194,133.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,938.20 : 643,411.92 = 129,421.44 : x
  2. Step 2: Convert to fraction form
    428,938.20/643,411.92 = 129,421.44/x
  3. Step 3: Cross multiply
    428,938.20x = 643,411.92 × 129,421.44
  4. Step 4: Simplify right side
    428,938.20x = 83,271,297,199.56
  5. Step 5: Solve for x
    x = 83,271,297,199.56/428,938.20
  6. Step 6: Final answer
    x = 194,133.55

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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.