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Finding the Fourth Proportional to 521.34, 719.49 and 324.90

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Solution

The fourth proportional to 521.34, 719.49 and 324.90 is: 448.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.34 : 719.49 = 324.90 : x
  2. Step 2: Convert to fraction form
    521.34/719.49 = 324.90/x
  3. Step 3: Cross multiply
    521.34x = 719.49 × 324.90
  4. Step 4: Simplify right side
    521.34x = 233,762.30
  5. Step 5: Solve for x
    x = 233,762.30/521.34
  6. Step 6: Final answer
    x = 448.39

Related Problems

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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.