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Finding the Fourth Proportional to 94.40, 142.40 and 90.40

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Solution

The fourth proportional to 94.40, 142.40 and 90.40 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.40 : 142.40 = 90.40 : x
  2. Step 2: Convert to fraction form
    94.40/142.40 = 90.40/x
  3. Step 3: Cross multiply
    94.40x = 142.40 × 90.40
  4. Step 4: Simplify right side
    94.40x = 12,872.96
  5. Step 5: Solve for x
    x = 12,872.96/94.40
  6. Step 6: Final answer
    x = 136.37

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.