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Finding the Fourth Proportional to 133.90, 200.72 and 56.80

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Solution

The fourth proportional to 133.90, 200.72 and 56.80 is: 85.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.90 : 200.72 = 56.80 : x
  2. Step 2: Convert to fraction form
    133.90/200.72 = 56.80/x
  3. Step 3: Cross multiply
    133.90x = 200.72 × 56.80
  4. Step 4: Simplify right side
    133.90x = 11,400.89
  5. Step 5: Solve for x
    x = 11,400.89/133.90
  6. Step 6: Final answer
    x = 85.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.