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Finding the Fourth Proportional to 427,401.70, 641,102.55 and 407,718.70

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Solution

The fourth proportional to 427,401.70, 641,102.55 and 407,718.70 is: 611,578.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,401.70 : 641,102.55 = 407,718.70 : x
  2. Step 2: Convert to fraction form
    427,401.70/641,102.55 = 407,718.70/x
  3. Step 3: Cross multiply
    427,401.70x = 641,102.55 × 407,718.70
  4. Step 4: Simplify right side
    427,401.70x = 261,389,498,252.69
  5. Step 5: Solve for x
    x = 261,389,498,252.69/427,401.70
  6. Step 6: Final answer
    x = 611,578.05

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Similar ratio
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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.