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Finding the Fourth Proportional to 811.16, 1,217.50 and 426.68

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Solution

The fourth proportional to 811.16, 1,217.50 and 426.68 is: 640.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.16 : 1,217.50 = 426.68 : x
  2. Step 2: Convert to fraction form
    811.16/1,217.50 = 426.68/x
  3. Step 3: Cross multiply
    811.16x = 1,217.50 × 426.68
  4. Step 4: Simplify right side
    811.16x = 519,482.90
  5. Step 5: Solve for x
    x = 519,482.90/811.16
  6. Step 6: Final answer
    x = 640.42

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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.