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Finding the Fourth Proportional to 427,491.40, 640,913.10 and 217,280.20

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Solution

The fourth proportional to 427,491.40, 640,913.10 and 217,280.20 is: 325,755.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,491.40 : 640,913.10 = 217,280.20 : x
  2. Step 2: Convert to fraction form
    427,491.40/640,913.10 = 217,280.20/x
  3. Step 3: Cross multiply
    427,491.40x = 640,913.10 × 217,280.20
  4. Step 4: Simplify right side
    427,491.40x = 139,257,726,550.62
  5. Step 5: Solve for x
    x = 139,257,726,550.62/427,491.40
  6. Step 6: Final answer
    x = 325,755.62

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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.