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Finding the Fourth Proportional to 291.70, 437.61 and 86.26

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Solution

The fourth proportional to 291.70, 437.61 and 86.26 is: 129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.70 : 437.61 = 86.26 : x
  2. Step 2: Convert to fraction form
    291.70/437.61 = 86.26/x
  3. Step 3: Cross multiply
    291.70x = 437.61 × 86.26
  4. Step 4: Simplify right side
    291.70x = 37,746.05
  5. Step 5: Solve for x
    x = 37,746.05/291.70
  6. Step 6: Final answer
    x = 129.40

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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.