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Finding the Fourth Proportional to 159.50, 220.21 and 100.51

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Solution

The fourth proportional to 159.50, 220.21 and 100.51 is: 138.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.50 : 220.21 = 100.51 : x
  2. Step 2: Convert to fraction form
    159.50/220.21 = 100.51/x
  3. Step 3: Cross multiply
    159.50x = 220.21 × 100.51
  4. Step 4: Simplify right side
    159.50x = 22,133.31
  5. Step 5: Solve for x
    x = 22,133.31/159.50
  6. Step 6: Final answer
    x = 138.77

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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.