Home / 428,979.60-643,469.40-271,904.40

Finding the Fourth Proportional to 428,979.60, 643,469.40 and 271,904.40

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Solution

The fourth proportional to 428,979.60, 643,469.40 and 271,904.40 is: 407,856.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,979.60 : 643,469.40 = 271,904.40 : x
  2. Step 2: Convert to fraction form
    428,979.60/643,469.40 = 271,904.40/x
  3. Step 3: Cross multiply
    428,979.60x = 643,469.40 × 271,904.40
  4. Step 4: Simplify right side
    428,979.60x = 174,962,161,125.36
  5. Step 5: Solve for x
    x = 174,962,161,125.36/428,979.60
  6. Step 6: Final answer
    x = 407,856.60

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1.5x scale

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.