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Finding the Fourth Proportional to 1,135.78, 1,567.42 and 638.41

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Solution

The fourth proportional to 1,135.78, 1,567.42 and 638.41 is: 881.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.78 : 1,567.42 = 638.41 : x
  2. Step 2: Convert to fraction form
    1,135.78/1,567.42 = 638.41/x
  3. Step 3: Cross multiply
    1,135.78x = 1,567.42 × 638.41
  4. Step 4: Simplify right side
    1,135.78x = 1,000,658.71
  5. Step 5: Solve for x
    x = 1,000,658.71/1,135.78
  6. Step 6: Final answer
    x = 881.04

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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.