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Finding the Fourth Proportional to 114.20, 157.20 and 98.72

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Solution

The fourth proportional to 114.20, 157.20 and 98.72 is: 135.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.20 : 157.20 = 98.72 : x
  2. Step 2: Convert to fraction form
    114.20/157.20 = 98.72/x
  3. Step 3: Cross multiply
    114.20x = 157.20 × 98.72
  4. Step 4: Simplify right side
    114.20x = 15,518.00
  5. Step 5: Solve for x
    x = 15,518.00/114.20
  6. Step 6: Final answer
    x = 135.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.