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Finding the Fourth Proportional to 107.13, 159.76 and 90.12

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Solution

The fourth proportional to 107.13, 159.76 and 90.12 is: 134.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.13 : 159.76 = 90.12 : x
  2. Step 2: Convert to fraction form
    107.13/159.76 = 90.12/x
  3. Step 3: Cross multiply
    107.13x = 159.76 × 90.12
  4. Step 4: Simplify right side
    107.13x = 14,397.57
  5. Step 5: Solve for x
    x = 14,397.57/107.13
  6. Step 6: Final answer
    x = 134.39

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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.