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Finding the Fourth Proportional to 1,138.08, 1,570.59 and 633.96

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Solution

The fourth proportional to 1,138.08, 1,570.59 and 633.96 is: 874.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.08 : 1,570.59 = 633.96 : x
  2. Step 2: Convert to fraction form
    1,138.08/1,570.59 = 633.96/x
  3. Step 3: Cross multiply
    1,138.08x = 1,570.59 × 633.96
  4. Step 4: Simplify right side
    1,138.08x = 995,691.24
  5. Step 5: Solve for x
    x = 995,691.24/1,138.08
  6. Step 6: Final answer
    x = 874.88

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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.