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Finding the Fourth Proportional to 1,491.90, 2,237.85 and 517.31

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Solution

The fourth proportional to 1,491.90, 2,237.85 and 517.31 is: 775.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.90 : 2,237.85 = 517.31 : x
  2. Step 2: Convert to fraction form
    1,491.90/2,237.85 = 517.31/x
  3. Step 3: Cross multiply
    1,491.90x = 2,237.85 × 517.31
  4. Step 4: Simplify right side
    1,491.90x = 1,157,665.84
  5. Step 5: Solve for x
    x = 1,157,665.84/1,491.90
  6. Step 6: Final answer
    x = 775.97

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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.