Home / 428,731.20-643,327.20-179,438.40

Finding the Fourth Proportional to 428,731.20, 643,327.20 and 179,438.40

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Solution

The fourth proportional to 428,731.20, 643,327.20 and 179,438.40 is: 269,254.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,731.20 : 643,327.20 = 179,438.40 : x
  2. Step 2: Convert to fraction form
    428,731.20/643,327.20 = 179,438.40/x
  3. Step 3: Cross multiply
    428,731.20x = 643,327.20 × 179,438.40
  4. Step 4: Simplify right side
    428,731.20x = 115,437,603,444.48
  5. Step 5: Solve for x
    x = 115,437,603,444.48/428,731.20
  6. Step 6: Final answer
    x = 269,254.03

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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.