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Finding the Fourth Proportional to 426,934.40, 640,401.60 and 131,446.40

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Solution

The fourth proportional to 426,934.40, 640,401.60 and 131,446.40 is: 197,169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,934.40 : 640,401.60 = 131,446.40 : x
  2. Step 2: Convert to fraction form
    426,934.40/640,401.60 = 131,446.40/x
  3. Step 3: Cross multiply
    426,934.40x = 640,401.60 × 131,446.40
  4. Step 4: Simplify right side
    426,934.40x = 84,178,484,874.24
  5. Step 5: Solve for x
    x = 84,178,484,874.24/426,934.40
  6. Step 6: Final answer
    x = 197,169.60

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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.