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Finding the Fourth Proportional to 667.29, 920.71 and 383.69

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Solution

The fourth proportional to 667.29, 920.71 and 383.69 is: 529.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.29 : 920.71 = 383.69 : x
  2. Step 2: Convert to fraction form
    667.29/920.71 = 383.69/x
  3. Step 3: Cross multiply
    667.29x = 920.71 × 383.69
  4. Step 4: Simplify right side
    667.29x = 353,267.22
  5. Step 5: Solve for x
    x = 353,267.22/667.29
  6. Step 6: Final answer
    x = 529.41

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.