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Finding the Fourth Proportional to 509.49, 764.51 and 388.49

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Solution

The fourth proportional to 509.49, 764.51 and 388.49 is: 582.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.49 : 764.51 = 388.49 : x
  2. Step 2: Convert to fraction form
    509.49/764.51 = 388.49/x
  3. Step 3: Cross multiply
    509.49x = 764.51 × 388.49
  4. Step 4: Simplify right side
    509.49x = 296,998.72
  5. Step 5: Solve for x
    x = 296,998.72/509.49
  6. Step 6: Final answer
    x = 582.93

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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.