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Finding the Fourth Proportional to 157.21, 235.76 and 54.47

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Solution

The fourth proportional to 157.21, 235.76 and 54.47 is: 81.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.21 : 235.76 = 54.47 : x
  2. Step 2: Convert to fraction form
    157.21/235.76 = 54.47/x
  3. Step 3: Cross multiply
    157.21x = 235.76 × 54.47
  4. Step 4: Simplify right side
    157.21x = 12,841.85
  5. Step 5: Solve for x
    x = 12,841.85/157.21
  6. Step 6: Final answer
    x = 81.69

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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.