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Finding the Fourth Proportional to 148.83, 205.43 and 90.64

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Solution

The fourth proportional to 148.83, 205.43 and 90.64 is: 125.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.83 : 205.43 = 90.64 : x
  2. Step 2: Convert to fraction form
    148.83/205.43 = 90.64/x
  3. Step 3: Cross multiply
    148.83x = 205.43 × 90.64
  4. Step 4: Simplify right side
    148.83x = 18,620.18
  5. Step 5: Solve for x
    x = 18,620.18/148.83
  6. Step 6: Final answer
    x = 125.11

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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.