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Finding the Third Proportional to 720 and 1,085.63

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Solution

The third proportional to 720 and 1,085.63 is: 1,636.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 1,085.63 = 1,085.63 : x
  2. Step 2: Convert to fraction form
    720/1,085.63 = 1,085.63/x
  3. Step 3: Cross multiply
    720x = 1,085.63 × 1,085.63
  4. Step 4: Simplify right side
    720x = 1,178,581.64
  5. Step 5: Solve for x
    x = 1,178,581.64/720
  6. Step 6: Final answer
    x = 1,636.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.