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Finding the Fourth Proportional to 868.26, 1,302.36 and 405.87

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Solution

The fourth proportional to 868.26, 1,302.36 and 405.87 is: 608.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.26 : 1,302.36 = 405.87 : x
  2. Step 2: Convert to fraction form
    868.26/1,302.36 = 405.87/x
  3. Step 3: Cross multiply
    868.26x = 1,302.36 × 405.87
  4. Step 4: Simplify right side
    868.26x = 528,588.85
  5. Step 5: Solve for x
    x = 528,588.85/868.26
  6. Step 6: Final answer
    x = 608.79

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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.