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Finding the Fourth Proportional to 668.17, 920.92 and 490.77

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Solution

The fourth proportional to 668.17, 920.92 and 490.77 is: 676.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.17 : 920.92 = 490.77 : x
  2. Step 2: Convert to fraction form
    668.17/920.92 = 490.77/x
  3. Step 3: Cross multiply
    668.17x = 920.92 × 490.77
  4. Step 4: Simplify right side
    668.17x = 451,959.91
  5. Step 5: Solve for x
    x = 451,959.91/668.17
  6. Step 6: Final answer
    x = 676.41

Related Problems

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.