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Finding the Fourth Proportional to 509.49, 764.24 and 326.70

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Solution

The fourth proportional to 509.49, 764.24 and 326.70 is: 490.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.49 : 764.24 = 326.70 : x
  2. Step 2: Convert to fraction form
    509.49/764.24 = 326.70/x
  3. Step 3: Cross multiply
    509.49x = 764.24 × 326.70
  4. Step 4: Simplify right side
    509.49x = 249,675.57
  5. Step 5: Solve for x
    x = 249,675.57/509.49
  6. Step 6: Final answer
    x = 490.05

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.