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Finding the Fourth Proportional to 431.11, 646.28 and 157.15

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Solution

The fourth proportional to 431.11, 646.28 and 157.15 is: 235.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.11 : 646.28 = 157.15 : x
  2. Step 2: Convert to fraction form
    431.11/646.28 = 157.15/x
  3. Step 3: Cross multiply
    431.11x = 646.28 × 157.15
  4. Step 4: Simplify right side
    431.11x = 101,558.88
  5. Step 5: Solve for x
    x = 101,558.88/431.11
  6. Step 6: Final answer
    x = 235.58

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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.