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Finding the Fourth Proportional to 149.51, 206.30 and 90.53

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Solution

The fourth proportional to 149.51, 206.30 and 90.53 is: 124.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.51 : 206.30 = 90.53 : x
  2. Step 2: Convert to fraction form
    149.51/206.30 = 90.53/x
  3. Step 3: Cross multiply
    149.51x = 206.30 × 90.53
  4. Step 4: Simplify right side
    149.51x = 18,675.89
  5. Step 5: Solve for x
    x = 18,675.89/149.51
  6. Step 6: Final answer
    x = 124.91

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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.