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Finding the Fourth Proportional to 459.97, 689.87 and 135.26

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Solution

The fourth proportional to 459.97, 689.87 and 135.26 is: 202.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.97 : 689.87 = 135.26 : x
  2. Step 2: Convert to fraction form
    459.97/689.87 = 135.26/x
  3. Step 3: Cross multiply
    459.97x = 689.87 × 135.26
  4. Step 4: Simplify right side
    459.97x = 93,311.82
  5. Step 5: Solve for x
    x = 93,311.82/459.97
  6. Step 6: Final answer
    x = 202.87

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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.