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Finding the Fourth Proportional to 191.61, 287.07 and 100.21

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Solution

The fourth proportional to 191.61, 287.07 and 100.21 is: 150.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.61 : 287.07 = 100.21 : x
  2. Step 2: Convert to fraction form
    191.61/287.07 = 100.21/x
  3. Step 3: Cross multiply
    191.61x = 287.07 × 100.21
  4. Step 4: Simplify right side
    191.61x = 28,767.28
  5. Step 5: Solve for x
    x = 28,767.28/191.61
  6. Step 6: Final answer
    x = 150.13

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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.