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Finding the Fourth Proportional to 458.51, 687.78 and 133.88

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Solution

The fourth proportional to 458.51, 687.78 and 133.88 is: 200.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.51 : 687.78 = 133.88 : x
  2. Step 2: Convert to fraction form
    458.51/687.78 = 133.88/x
  3. Step 3: Cross multiply
    458.51x = 687.78 × 133.88
  4. Step 4: Simplify right side
    458.51x = 92,075.88
  5. Step 5: Solve for x
    x = 92,075.88/458.51
  6. Step 6: Final answer
    x = 200.82

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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.