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Finding the Fourth Proportional to 868.55, 1,302.84 and 313.22

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Solution

The fourth proportional to 868.55, 1,302.84 and 313.22 is: 469.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.55 : 1,302.84 = 313.22 : x
  2. Step 2: Convert to fraction form
    868.55/1,302.84 = 313.22/x
  3. Step 3: Cross multiply
    868.55x = 1,302.84 × 313.22
  4. Step 4: Simplify right side
    868.55x = 408,069.03
  5. Step 5: Solve for x
    x = 408,069.03/868.55
  6. Step 6: Final answer
    x = 469.83

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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.