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Finding the Third Proportional to 720 and 812.25

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Solution

The third proportional to 720 and 812.25 is: 916.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 812.25 = 812.25 : x
  2. Step 2: Convert to fraction form
    720/812.25 = 812.25/x
  3. Step 3: Cross multiply
    720x = 812.25 × 812.25
  4. Step 4: Simplify right side
    720x = 659,750.06
  5. Step 5: Solve for x
    x = 659,750.06/720
  6. Step 6: Final answer
    x = 916.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.