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Finding the Fourth Proportional to 146.40, 202.06 and 87.40

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Solution

The fourth proportional to 146.40, 202.06 and 87.40 is: 120.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.40 : 202.06 = 87.40 : x
  2. Step 2: Convert to fraction form
    146.40/202.06 = 87.40/x
  3. Step 3: Cross multiply
    146.40x = 202.06 × 87.40
  4. Step 4: Simplify right side
    146.40x = 17,660.04
  5. Step 5: Solve for x
    x = 17,660.04/146.40
  6. Step 6: Final answer
    x = 120.63

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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.