Home / 428,931.20-643,627.20-179,638.40

Finding the Fourth Proportional to 428,931.20, 643,627.20 and 179,638.40

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Solution

The fourth proportional to 428,931.20, 643,627.20 and 179,638.40 is: 269,554.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,931.20 : 643,627.20 = 179,638.40 : x
  2. Step 2: Convert to fraction form
    428,931.20/643,627.20 = 179,638.40/x
  3. Step 3: Cross multiply
    428,931.20x = 643,627.20 × 179,638.40
  4. Step 4: Simplify right side
    428,931.20x = 115,620,160,404.48
  5. Step 5: Solve for x
    x = 115,620,160,404.48/428,931.20
  6. Step 6: Final answer
    x = 269,554.09

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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.