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Finding the Fourth Proportional to 191.35, 287.13 and 104.72

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Solution

The fourth proportional to 191.35, 287.13 and 104.72 is: 157.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.35 : 287.13 = 104.72 : x
  2. Step 2: Convert to fraction form
    191.35/287.13 = 104.72/x
  3. Step 3: Cross multiply
    191.35x = 287.13 × 104.72
  4. Step 4: Simplify right side
    191.35x = 30,068.83
  5. Step 5: Solve for x
    x = 30,068.83/191.35
  6. Step 6: Final answer
    x = 157.14

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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.