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Finding the Third Proportional to 155.91 and 328.90

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Solution

The third proportional to 155.91 and 328.90 is: 693.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.91 : 328.90 = 328.90 : x
  2. Step 2: Convert to fraction form
    155.91/328.90 = 328.90/x
  3. Step 3: Cross multiply
    155.91x = 328.90 × 328.90
  4. Step 4: Simplify right side
    155.91x = 108,178.04
  5. Step 5: Solve for x
    x = 108,178.04/155.91
  6. Step 6: Final answer
    x = 693.85

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.