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Finding the Fourth Proportional to 194.30, 291.45 and 86.08

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Solution

The fourth proportional to 194.30, 291.45 and 86.08 is: 129.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.30 : 291.45 = 86.08 : x
  2. Step 2: Convert to fraction form
    194.30/291.45 = 86.08/x
  3. Step 3: Cross multiply
    194.30x = 291.45 × 86.08
  4. Step 4: Simplify right side
    194.30x = 25,088.02
  5. Step 5: Solve for x
    x = 25,088.02/194.30
  6. Step 6: Final answer
    x = 129.12

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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.