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Finding the Fourth Proportional to 1,214.76, 1,676.31 and 717.36

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Solution

The fourth proportional to 1,214.76, 1,676.31 and 717.36 is: 989.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.76 : 1,676.31 = 717.36 : x
  2. Step 2: Convert to fraction form
    1,214.76/1,676.31 = 717.36/x
  3. Step 3: Cross multiply
    1,214.76x = 1,676.31 × 717.36
  4. Step 4: Simplify right side
    1,214.76x = 1,202,517.74
  5. Step 5: Solve for x
    x = 1,202,517.74/1,214.76
  6. Step 6: Final answer
    x = 989.92

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Half scale
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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.