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Finding the Fourth Proportional to 157.25, 235.65 and 65.90

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Solution

The fourth proportional to 157.25, 235.65 and 65.90 is: 98.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.25 : 235.65 = 65.90 : x
  2. Step 2: Convert to fraction form
    157.25/235.65 = 65.90/x
  3. Step 3: Cross multiply
    157.25x = 235.65 × 65.90
  4. Step 4: Simplify right side
    157.25x = 15,529.34
  5. Step 5: Solve for x
    x = 15,529.34/157.25
  6. Step 6: Final answer
    x = 98.76

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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.