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Finding the Fourth Proportional to 1,718.81, 2,578.22 and 486.21

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Solution

The fourth proportional to 1,718.81, 2,578.22 and 486.21 is: 729.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.81 : 2,578.22 = 486.21 : x
  2. Step 2: Convert to fraction form
    1,718.81/2,578.22 = 486.21/x
  3. Step 3: Cross multiply
    1,718.81x = 2,578.22 × 486.21
  4. Step 4: Simplify right side
    1,718.81x = 1,253,553.92
  5. Step 5: Solve for x
    x = 1,253,553.92/1,718.81
  6. Step 6: Final answer
    x = 729.32

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.