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Finding the Fourth Proportional to 155.81, 214.95 and 100.64

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Solution

The fourth proportional to 155.81, 214.95 and 100.64 is: 138.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.81 : 214.95 = 100.64 : x
  2. Step 2: Convert to fraction form
    155.81/214.95 = 100.64/x
  3. Step 3: Cross multiply
    155.81x = 214.95 × 100.64
  4. Step 4: Simplify right side
    155.81x = 21,632.57
  5. Step 5: Solve for x
    x = 21,632.57/155.81
  6. Step 6: Final answer
    x = 138.84

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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.