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Finding the Fourth Proportional to 868.68, 1,303.53 and 664.56

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Solution

The fourth proportional to 868.68, 1,303.53 and 664.56 is: 997.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.68 : 1,303.53 = 664.56 : x
  2. Step 2: Convert to fraction form
    868.68/1,303.53 = 664.56/x
  3. Step 3: Cross multiply
    868.68x = 1,303.53 × 664.56
  4. Step 4: Simplify right side
    868.68x = 866,273.90
  5. Step 5: Solve for x
    x = 866,273.90/868.68
  6. Step 6: Final answer
    x = 997.23

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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.