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Finding the Fourth Proportional to 380.69, 525.53 and 287.47

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Solution

The fourth proportional to 380.69, 525.53 and 287.47 is: 396.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.69 : 525.53 = 287.47 : x
  2. Step 2: Convert to fraction form
    380.69/525.53 = 287.47/x
  3. Step 3: Cross multiply
    380.69x = 525.53 × 287.47
  4. Step 4: Simplify right side
    380.69x = 151,074.11
  5. Step 5: Solve for x
    x = 151,074.11/380.69
  6. Step 6: Final answer
    x = 396.84

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Double scale
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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.