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Finding the Fourth Proportional to 431.12, 646.56 and 171.02

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Solution

The fourth proportional to 431.12, 646.56 and 171.02 is: 256.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.12 : 646.56 = 171.02 : x
  2. Step 2: Convert to fraction form
    431.12/646.56 = 171.02/x
  3. Step 3: Cross multiply
    431.12x = 646.56 × 171.02
  4. Step 4: Simplify right side
    431.12x = 110,576.31
  5. Step 5: Solve for x
    x = 110,576.31/431.12
  6. Step 6: Final answer
    x = 256.48

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Double scale
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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.