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Finding the Fourth Proportional to 717.21, 988.75 and 481.20

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Solution

The fourth proportional to 717.21, 988.75 and 481.20 is: 663.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.21 : 988.75 = 481.20 : x
  2. Step 2: Convert to fraction form
    717.21/988.75 = 481.20/x
  3. Step 3: Cross multiply
    717.21x = 988.75 × 481.20
  4. Step 4: Simplify right side
    717.21x = 475,786.50
  5. Step 5: Solve for x
    x = 475,786.50/717.21
  6. Step 6: Final answer
    x = 663.39

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.