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Finding the Fourth Proportional to 1,287.26, 1,930.88 and 637.84

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Solution

The fourth proportional to 1,287.26, 1,930.88 and 637.84 is: 956.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.26 : 1,930.88 = 637.84 : x
  2. Step 2: Convert to fraction form
    1,287.26/1,930.88 = 637.84/x
  3. Step 3: Cross multiply
    1,287.26x = 1,930.88 × 637.84
  4. Step 4: Simplify right side
    1,287.26x = 1,231,582.84
  5. Step 5: Solve for x
    x = 1,231,582.84/1,287.26
  6. Step 6: Final answer
    x = 956.75

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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.