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Finding the Fourth Proportional to 157.06, 235.05 and 138.70

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Solution

The fourth proportional to 157.06, 235.05 and 138.70 is: 207.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.06 : 235.05 = 138.70 : x
  2. Step 2: Convert to fraction form
    157.06/235.05 = 138.70/x
  3. Step 3: Cross multiply
    157.06x = 235.05 × 138.70
  4. Step 4: Simplify right side
    157.06x = 32,601.44
  5. Step 5: Solve for x
    x = 32,601.44/157.06
  6. Step 6: Final answer
    x = 207.57

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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.