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Finding the Fourth Proportional to 191.07, 285.55 and 139.82

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Solution

The fourth proportional to 191.07, 285.55 and 139.82 is: 208.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.07 : 285.55 = 139.82 : x
  2. Step 2: Convert to fraction form
    191.07/285.55 = 139.82/x
  3. Step 3: Cross multiply
    191.07x = 285.55 × 139.82
  4. Step 4: Simplify right side
    191.07x = 39,923.82
  5. Step 5: Solve for x
    x = 39,923.82/191.07
  6. Step 6: Final answer
    x = 208.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.