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Finding the Fourth Proportional to 94.35, 140.55 and 90.23

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Solution

The fourth proportional to 94.35, 140.55 and 90.23 is: 134.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.35 : 140.55 = 90.23 : x
  2. Step 2: Convert to fraction form
    94.35/140.55 = 90.23/x
  3. Step 3: Cross multiply
    94.35x = 140.55 × 90.23
  4. Step 4: Simplify right side
    94.35x = 12,681.83
  5. Step 5: Solve for x
    x = 12,681.83/94.35
  6. Step 6: Final answer
    x = 134.41

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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.