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Finding the Fourth Proportional to 191.92, 287.90 and 70.15

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Solution

The fourth proportional to 191.92, 287.90 and 70.15 is: 105.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.92 : 287.90 = 70.15 : x
  2. Step 2: Convert to fraction form
    191.92/287.90 = 70.15/x
  3. Step 3: Cross multiply
    191.92x = 287.90 × 70.15
  4. Step 4: Simplify right side
    191.92x = 20,196.19
  5. Step 5: Solve for x
    x = 20,196.19/191.92
  6. Step 6: Final answer
    x = 105.23

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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.