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Finding the Fourth Proportional to 1,491.86, 2,238.60 and 626.78

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Solution

The fourth proportional to 1,491.86, 2,238.60 and 626.78 is: 940.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,491.86 : 2,238.60 = 626.78 : x
  2. Step 2: Convert to fraction form
    1,491.86/2,238.60 = 626.78/x
  3. Step 3: Cross multiply
    1,491.86x = 2,238.60 × 626.78
  4. Step 4: Simplify right side
    1,491.86x = 1,403,109.71
  5. Step 5: Solve for x
    x = 1,403,109.71/1,491.86
  6. Step 6: Final answer
    x = 940.51

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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.