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Finding the Fourth Proportional to 291.64, 437.82 and 129.40

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Solution

The fourth proportional to 291.64, 437.82 and 129.40 is: 194.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.64 : 437.82 = 129.40 : x
  2. Step 2: Convert to fraction form
    291.64/437.82 = 129.40/x
  3. Step 3: Cross multiply
    291.64x = 437.82 × 129.40
  4. Step 4: Simplify right side
    291.64x = 56,653.91
  5. Step 5: Solve for x
    x = 56,653.91/291.64
  6. Step 6: Final answer
    x = 194.26

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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.