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Finding the Fourth Proportional to 105.77, 157.75 and 91.40

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Solution

The fourth proportional to 105.77, 157.75 and 91.40 is: 136.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.77 : 157.75 = 91.40 : x
  2. Step 2: Convert to fraction form
    105.77/157.75 = 91.40/x
  3. Step 3: Cross multiply
    105.77x = 157.75 × 91.40
  4. Step 4: Simplify right side
    105.77x = 14,417.33
  5. Step 5: Solve for x
    x = 14,417.33/105.77
  6. Step 6: Final answer
    x = 136.31

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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.