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Finding the Fourth Proportional to 105.13, 157.39 and 76.15

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Solution

The fourth proportional to 105.13, 157.39 and 76.15 is: 114.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.13 : 157.39 = 76.15 : x
  2. Step 2: Convert to fraction form
    105.13/157.39 = 76.15/x
  3. Step 3: Cross multiply
    105.13x = 157.39 × 76.15
  4. Step 4: Simplify right side
    105.13x = 11,985.25
  5. Step 5: Solve for x
    x = 11,985.25/105.13
  6. Step 6: Final answer
    x = 114.00

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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.