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Finding the Fourth Proportional to 105.13, 156.94 and 98.31

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Solution

The fourth proportional to 105.13, 156.94 and 98.31 is: 146.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.13 : 156.94 = 98.31 : x
  2. Step 2: Convert to fraction form
    105.13/156.94 = 98.31/x
  3. Step 3: Cross multiply
    105.13x = 156.94 × 98.31
  4. Step 4: Simplify right side
    105.13x = 15,428.77
  5. Step 5: Solve for x
    x = 15,428.77/105.13
  6. Step 6: Final answer
    x = 146.76

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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.