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Finding the Fourth Proportional to 155.90, 214.92 and 106.70

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Solution

The fourth proportional to 155.90, 214.92 and 106.70 is: 147.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.90 : 214.92 = 106.70 : x
  2. Step 2: Convert to fraction form
    155.90/214.92 = 106.70/x
  3. Step 3: Cross multiply
    155.90x = 214.92 × 106.70
  4. Step 4: Simplify right side
    155.90x = 22,931.96
  5. Step 5: Solve for x
    x = 22,931.96/155.90
  6. Step 6: Final answer
    x = 147.09

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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.