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Finding the Third Proportional to 328.90 and 709.07

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Solution

The third proportional to 328.90 and 709.07 is: 1,528.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.90 : 709.07 = 709.07 : x
  2. Step 2: Convert to fraction form
    328.90/709.07 = 709.07/x
  3. Step 3: Cross multiply
    328.90x = 709.07 × 709.07
  4. Step 4: Simplify right side
    328.90x = 502,775.17
  5. Step 5: Solve for x
    x = 502,775.17/328.90
  6. Step 6: Final answer
    x = 1,528.64

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.