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Finding the Fourth Proportional to 862.02, 1,291.94 and 399.16

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Solution

The fourth proportional to 862.02, 1,291.94 and 399.16 is: 598.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.02 : 1,291.94 = 399.16 : x
  2. Step 2: Convert to fraction form
    862.02/1,291.94 = 399.16/x
  3. Step 3: Cross multiply
    862.02x = 1,291.94 × 399.16
  4. Step 4: Simplify right side
    862.02x = 515,690.77
  5. Step 5: Solve for x
    x = 515,690.77/862.02
  6. Step 6: Final answer
    x = 598.24

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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.