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Finding the Fourth Proportional to 666.28, 920.82 and 518.76

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Solution

The fourth proportional to 666.28, 920.82 and 518.76 is: 716.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.28 : 920.82 = 518.76 : x
  2. Step 2: Convert to fraction form
    666.28/920.82 = 518.76/x
  3. Step 3: Cross multiply
    666.28x = 920.82 × 518.76
  4. Step 4: Simplify right side
    666.28x = 477,684.58
  5. Step 5: Solve for x
    x = 477,684.58/666.28
  6. Step 6: Final answer
    x = 716.94

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.