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Finding the Fourth Proportional to 1,215.19, 1,676.89 and 717.71

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Solution

The fourth proportional to 1,215.19, 1,676.89 and 717.71 is: 990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.19 : 1,676.89 = 717.71 : x
  2. Step 2: Convert to fraction form
    1,215.19/1,676.89 = 717.71/x
  3. Step 3: Cross multiply
    1,215.19x = 1,676.89 × 717.71
  4. Step 4: Simplify right side
    1,215.19x = 1,203,523.12
  5. Step 5: Solve for x
    x = 1,203,523.12/1,215.19
  6. Step 6: Final answer
    x = 990.40

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Half 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.