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Finding the Fourth Proportional to 551.72, 761.46 and 330.68

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Solution

The fourth proportional to 551.72, 761.46 and 330.68 is: 456.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.72 : 761.46 = 330.68 : x
  2. Step 2: Convert to fraction form
    551.72/761.46 = 330.68/x
  3. Step 3: Cross multiply
    551.72x = 761.46 × 330.68
  4. Step 4: Simplify right side
    551.72x = 251,799.59
  5. Step 5: Solve for x
    x = 251,799.59/551.72
  6. Step 6: Final answer
    x = 456.39

Related Problems

Find fourth proportional to 275.86, 380.73 and 165.34
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.