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Finding the Fourth Proportional to 1,138.22, 1,570.74 and 640.86

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Solution

The fourth proportional to 1,138.22, 1,570.74 and 640.86 is: 884.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.22 : 1,570.74 = 640.86 : x
  2. Step 2: Convert to fraction form
    1,138.22/1,570.74 = 640.86/x
  3. Step 3: Cross multiply
    1,138.22x = 1,570.74 × 640.86
  4. Step 4: Simplify right side
    1,138.22x = 1,006,624.44
  5. Step 5: Solve for x
    x = 1,006,624.44/1,138.22
  6. Step 6: Final answer
    x = 884.38

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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.