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Finding the Fourth Proportional to 107.60, 160.45 and 87.20

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Solution

The fourth proportional to 107.60, 160.45 and 87.20 is: 130.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.60 : 160.45 = 87.20 : x
  2. Step 2: Convert to fraction form
    107.60/160.45 = 87.20/x
  3. Step 3: Cross multiply
    107.60x = 160.45 × 87.20
  4. Step 4: Simplify right side
    107.60x = 13,991.24
  5. Step 5: Solve for x
    x = 13,991.24/107.60
  6. Step 6: Final answer
    x = 130.03

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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.