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Finding the Fourth Proportional to 427,134.40, 640,701.60 and 344,190.40

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Solution

The fourth proportional to 427,134.40, 640,701.60 and 344,190.40 is: 516,285.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,134.40 : 640,701.60 = 344,190.40 : x
  2. Step 2: Convert to fraction form
    427,134.40/640,701.60 = 344,190.40/x
  3. Step 3: Cross multiply
    427,134.40x = 640,701.60 × 344,190.40
  4. Step 4: Simplify right side
    427,134.40x = 220,523,339,984.64
  5. Step 5: Solve for x
    x = 220,523,339,984.64/427,134.40
  6. Step 6: Final answer
    x = 516,285.60

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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.