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Finding the Third Proportional to 157 and 318.50

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Solution

The third proportional to 157 and 318.50 is: 646.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    157 : 318.50 = 318.50 : x
  2. Step 2: Convert to fraction form
    157/318.50 = 318.50/x
  3. Step 3: Cross multiply
    157x = 318.50 × 318.50
  4. Step 4: Simplify right side
    157x = 101,442.25
  5. Step 5: Solve for x
    x = 101,442.25/157
  6. Step 6: Final answer
    x = 646.13

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Why These Related Problems?

These problems maintain the same ratio (2.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.