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Finding the Fourth Proportional to 157.18, 235.69 and 74.89

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Solution

The fourth proportional to 157.18, 235.69 and 74.89 is: 112.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.18 : 235.69 = 74.89 : x
  2. Step 2: Convert to fraction form
    157.18/235.69 = 74.89/x
  3. Step 3: Cross multiply
    157.18x = 235.69 × 74.89
  4. Step 4: Simplify right side
    157.18x = 17,650.82
  5. Step 5: Solve for x
    x = 17,650.82/157.18
  6. Step 6: Final answer
    x = 112.30

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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.