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Finding the Fourth Proportional to 1,011.66, 1,517.37 and 426.90

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Solution

The fourth proportional to 1,011.66, 1,517.37 and 426.90 is: 640.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.66 : 1,517.37 = 426.90 : x
  2. Step 2: Convert to fraction form
    1,011.66/1,517.37 = 426.90/x
  3. Step 3: Cross multiply
    1,011.66x = 1,517.37 × 426.90
  4. Step 4: Simplify right side
    1,011.66x = 647,762.01
  5. Step 5: Solve for x
    x = 647,762.01/1,011.66
  6. Step 6: Final answer
    x = 640.29

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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.