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Finding the Fourth Proportional to 105.42, 157.05 and 98.40

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Solution

The fourth proportional to 105.42, 157.05 and 98.40 is: 146.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.42 : 157.05 = 98.40 : x
  2. Step 2: Convert to fraction form
    105.42/157.05 = 98.40/x
  3. Step 3: Cross multiply
    105.42x = 157.05 × 98.40
  4. Step 4: Simplify right side
    105.42x = 15,453.72
  5. Step 5: Solve for x
    x = 15,453.72/105.42
  6. Step 6: Final answer
    x = 146.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.