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Finding the Fourth Proportional to 157.20, 235.38 and 102.90

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Solution

The fourth proportional to 157.20, 235.38 and 102.90 is: 154.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.20 : 235.38 = 102.90 : x
  2. Step 2: Convert to fraction form
    157.20/235.38 = 102.90/x
  3. Step 3: Cross multiply
    157.20x = 235.38 × 102.90
  4. Step 4: Simplify right side
    157.20x = 24,220.60
  5. Step 5: Solve for x
    x = 24,220.60/157.20
  6. Step 6: Final answer
    x = 154.08

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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.