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Finding the Fourth Proportional to 725.72, 1,000.75 and 621.15

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Solution

The fourth proportional to 725.72, 1,000.75 and 621.15 is: 856.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.72 : 1,000.75 = 621.15 : x
  2. Step 2: Convert to fraction form
    725.72/1,000.75 = 621.15/x
  3. Step 3: Cross multiply
    725.72x = 1,000.75 × 621.15
  4. Step 4: Simplify right side
    725.72x = 621,615.86
  5. Step 5: Solve for x
    x = 621,615.86/725.72
  6. Step 6: Final answer
    x = 856.55

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.