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Finding the Fourth Proportional to 105.10, 157.68 and 84.76

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Solution

The fourth proportional to 105.10, 157.68 and 84.76 is: 127.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.10 : 157.68 = 84.76 : x
  2. Step 2: Convert to fraction form
    105.10/157.68 = 84.76/x
  3. Step 3: Cross multiply
    105.10x = 157.68 × 84.76
  4. Step 4: Simplify right side
    105.10x = 13,364.96
  5. Step 5: Solve for x
    x = 13,364.96/105.10
  6. Step 6: Final answer
    x = 127.16

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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.