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Finding the Fourth Proportional to 287.99, 397.60 and 177.61

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Solution

The fourth proportional to 287.99, 397.60 and 177.61 is: 245.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.99 : 397.60 = 177.61 : x
  2. Step 2: Convert to fraction form
    287.99/397.60 = 177.61/x
  3. Step 3: Cross multiply
    287.99x = 397.60 × 177.61
  4. Step 4: Simplify right side
    287.99x = 70,618.29
  5. Step 5: Solve for x
    x = 70,618.29/287.99
  6. Step 6: Final answer
    x = 245.21

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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.