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Finding the Fourth Proportional to 862.25, 1,292.36 and 399.05

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Solution

The fourth proportional to 862.25, 1,292.36 and 399.05 is: 598.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.25 : 1,292.36 = 399.05 : x
  2. Step 2: Convert to fraction form
    862.25/1,292.36 = 399.05/x
  3. Step 3: Cross multiply
    862.25x = 1,292.36 × 399.05
  4. Step 4: Simplify right side
    862.25x = 515,718.06
  5. Step 5: Solve for x
    x = 515,718.06/862.25
  6. Step 6: Final answer
    x = 598.11

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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.