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Finding the Fourth Proportional to 1,135.76, 1,567.31 and 638.42

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Solution

The fourth proportional to 1,135.76, 1,567.31 and 638.42 is: 880.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.76 : 1,567.31 = 638.42 : x
  2. Step 2: Convert to fraction form
    1,135.76/1,567.31 = 638.42/x
  3. Step 3: Cross multiply
    1,135.76x = 1,567.31 × 638.42
  4. Step 4: Simplify right side
    1,135.76x = 1,000,591.02
  5. Step 5: Solve for x
    x = 1,000,591.02/1,135.76
  6. Step 6: Final answer
    x = 880.99

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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.