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Finding the Fourth Proportional to 868.42, 1,302.06 and 399.69

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Solution

The fourth proportional to 868.42, 1,302.06 and 399.69 is: 599.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.42 : 1,302.06 = 399.69 : x
  2. Step 2: Convert to fraction form
    868.42/1,302.06 = 399.69/x
  3. Step 3: Cross multiply
    868.42x = 1,302.06 × 399.69
  4. Step 4: Simplify right side
    868.42x = 520,423.75
  5. Step 5: Solve for x
    x = 520,423.75/868.42
  6. Step 6: Final answer
    x = 599.28

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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.