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Finding the Fourth Proportional to 459.77, 690 and 254.51

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Solution

The fourth proportional to 459.77, 690 and 254.51 is: 381.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.77 : 690 = 254.51 : x
  2. Step 2: Convert to fraction form
    459.77/690 = 254.51/x
  3. Step 3: Cross multiply
    459.77x = 690 × 254.51
  4. Step 4: Simplify right side
    459.77x = 175,611.90
  5. Step 5: Solve for x
    x = 175,611.90/459.77
  6. Step 6: Final answer
    x = 381.96

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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.