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Finding the Fourth Proportional to 291.80, 437.65 and 109.15

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Solution

The fourth proportional to 291.80, 437.65 and 109.15 is: 163.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.80 : 437.65 = 109.15 : x
  2. Step 2: Convert to fraction form
    291.80/437.65 = 109.15/x
  3. Step 3: Cross multiply
    291.80x = 437.65 × 109.15
  4. Step 4: Simplify right side
    291.80x = 47,768.13
  5. Step 5: Solve for x
    x = 47,768.13/291.80
  6. Step 6: Final answer
    x = 163.70

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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.