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Finding the Fourth Proportional to 458.05, 687.19 and 133.45

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Solution

The fourth proportional to 458.05, 687.19 and 133.45 is: 200.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.05 : 687.19 = 133.45 : x
  2. Step 2: Convert to fraction form
    458.05/687.19 = 133.45/x
  3. Step 3: Cross multiply
    458.05x = 687.19 × 133.45
  4. Step 4: Simplify right side
    458.05x = 91,705.51
  5. Step 5: Solve for x
    x = 91,705.51/458.05
  6. Step 6: Final answer
    x = 200.21

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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.