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Finding the Fourth Proportional to 157.87, 235.72 and 139.65

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Solution

The fourth proportional to 157.87, 235.72 and 139.65 is: 208.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.87 : 235.72 = 139.65 : x
  2. Step 2: Convert to fraction form
    157.87/235.72 = 139.65/x
  3. Step 3: Cross multiply
    157.87x = 235.72 × 139.65
  4. Step 4: Simplify right side
    157.87x = 32,918.30
  5. Step 5: Solve for x
    x = 32,918.30/157.87
  6. Step 6: Final answer
    x = 208.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.