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Finding the Fourth Proportional to 119.40, 164.80 and 75.15

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Solution

The fourth proportional to 119.40, 164.80 and 75.15 is: 103.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.40 : 164.80 = 75.15 : x
  2. Step 2: Convert to fraction form
    119.40/164.80 = 75.15/x
  3. Step 3: Cross multiply
    119.40x = 164.80 × 75.15
  4. Step 4: Simplify right side
    119.40x = 12,384.72
  5. Step 5: Solve for x
    x = 12,384.72/119.40
  6. Step 6: Final answer
    x = 103.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.