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Finding the Fourth Proportional to 1,135.87, 1,567.46 and 638.56

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Solution

The fourth proportional to 1,135.87, 1,567.46 and 638.56 is: 881.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.87 : 1,567.46 = 638.56 : x
  2. Step 2: Convert to fraction form
    1,135.87/1,567.46 = 638.56/x
  3. Step 3: Cross multiply
    1,135.87x = 1,567.46 × 638.56
  4. Step 4: Simplify right side
    1,135.87x = 1,000,917.30
  5. Step 5: Solve for x
    x = 1,000,917.30/1,135.87
  6. Step 6: Final answer
    x = 881.19

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1.5x scale

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.