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Finding the Fourth Proportional to 316.58, 437.20 and 261.90

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Solution

The fourth proportional to 316.58, 437.20 and 261.90 is: 361.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.58 : 437.20 = 261.90 : x
  2. Step 2: Convert to fraction form
    316.58/437.20 = 261.90/x
  3. Step 3: Cross multiply
    316.58x = 437.20 × 261.90
  4. Step 4: Simplify right side
    316.58x = 114,502.03
  5. Step 5: Solve for x
    x = 114,502.03/316.58
  6. Step 6: Final answer
    x = 361.69

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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.