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Finding the Fourth Proportional to 1,109.78, 1,531.57 and 637.75

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Solution

The fourth proportional to 1,109.78, 1,531.57 and 637.75 is: 880.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.78 : 1,531.57 = 637.75 : x
  2. Step 2: Convert to fraction form
    1,109.78/1,531.57 = 637.75/x
  3. Step 3: Cross multiply
    1,109.78x = 1,531.57 × 637.75
  4. Step 4: Simplify right side
    1,109.78x = 976,758.77
  5. Step 5: Solve for x
    x = 976,758.77/1,109.78
  6. Step 6: Final answer
    x = 880.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.