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Finding the Fourth Proportional to 149, 205.58 and 90.76

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Solution

The fourth proportional to 149, 205.58 and 90.76 is: 125.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    149 : 205.58 = 90.76 : x
  2. Step 2: Convert to fraction form
    149/205.58 = 90.76/x
  3. Step 3: Cross multiply
    149x = 205.58 × 90.76
  4. Step 4: Simplify right side
    149x = 18,658.44
  5. Step 5: Solve for x
    x = 18,658.44/149
  6. Step 6: Final answer
    x = 125.22

Related Problems

Find fourth proportional to 74.50, 102.79 and 45.38
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1.5x scale

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.