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Finding the Fourth Proportional to 157.90, 236.70 and 71.20

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Solution

The fourth proportional to 157.90, 236.70 and 71.20 is: 106.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.90 : 236.70 = 71.20 : x
  2. Step 2: Convert to fraction form
    157.90/236.70 = 71.20/x
  3. Step 3: Cross multiply
    157.90x = 236.70 × 71.20
  4. Step 4: Simplify right side
    157.90x = 16,852.30
  5. Step 5: Solve for x
    x = 16,852.30/157.90
  6. Step 6: Final answer
    x = 106.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.