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Finding the Fourth Proportional to 148.81, 205.40 and 90.63

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Solution

The fourth proportional to 148.81, 205.40 and 90.63 is: 125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.81 : 205.40 = 90.63 : x
  2. Step 2: Convert to fraction form
    148.81/205.40 = 90.63/x
  3. Step 3: Cross multiply
    148.81x = 205.40 × 90.63
  4. Step 4: Simplify right side
    148.81x = 18,615.40
  5. Step 5: Solve for x
    x = 18,615.40/148.81
  6. Step 6: Final answer
    x = 125.10

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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.