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Finding the Fourth Proportional to 157.03, 235.42 and 74.72

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Solution

The fourth proportional to 157.03, 235.42 and 74.72 is: 112.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.03 : 235.42 = 74.72 : x
  2. Step 2: Convert to fraction form
    157.03/235.42 = 74.72/x
  3. Step 3: Cross multiply
    157.03x = 235.42 × 74.72
  4. Step 4: Simplify right side
    157.03x = 17,590.60
  5. Step 5: Solve for x
    x = 17,590.60/157.03
  6. Step 6: Final answer
    x = 112.02

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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.