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Finding the Fourth Proportional to 1,567.35, 2,163 and 868.72

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Solution

The fourth proportional to 1,567.35, 2,163 and 868.72 is: 1,198.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,567.35 : 2,163 = 868.72 : x
  2. Step 2: Convert to fraction form
    1,567.35/2,163 = 868.72/x
  3. Step 3: Cross multiply
    1,567.35x = 2,163 × 868.72
  4. Step 4: Simplify right side
    1,567.35x = 1,879,041.36
  5. Step 5: Solve for x
    x = 1,879,041.36/1,567.35
  6. Step 6: Final answer
    x = 1,198.87

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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.