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Finding the Fourth Proportional to 157.31, 235.79 and 70.68

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Solution

The fourth proportional to 157.31, 235.79 and 70.68 is: 105.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.31 : 235.79 = 70.68 : x
  2. Step 2: Convert to fraction form
    157.31/235.79 = 70.68/x
  3. Step 3: Cross multiply
    157.31x = 235.79 × 70.68
  4. Step 4: Simplify right side
    157.31x = 16,665.28
  5. Step 5: Solve for x
    x = 16,665.28/157.31
  6. Step 6: Final answer
    x = 105.94

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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.