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Finding the Fourth Proportional to 868.62, 1,303.50 and 810.95

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Solution

The fourth proportional to 868.62, 1,303.50 and 810.95 is: 1,216.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.62 : 1,303.50 = 810.95 : x
  2. Step 2: Convert to fraction form
    868.62/1,303.50 = 810.95/x
  3. Step 3: Cross multiply
    868.62x = 1,303.50 × 810.95
  4. Step 4: Simplify right side
    868.62x = 1,057,073.33
  5. Step 5: Solve for x
    x = 1,057,073.33/868.62
  6. Step 6: Final answer
    x = 1,216.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.