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Finding the Fourth Proportional to 191.47, 264.07 and 138.91

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Solution

The fourth proportional to 191.47, 264.07 and 138.91 is: 191.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.47 : 264.07 = 138.91 : x
  2. Step 2: Convert to fraction form
    191.47/264.07 = 138.91/x
  3. Step 3: Cross multiply
    191.47x = 264.07 × 138.91
  4. Step 4: Simplify right side
    191.47x = 36,681.96
  5. Step 5: Solve for x
    x = 36,681.96/191.47
  6. Step 6: Final answer
    x = 191.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.