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Finding the Fourth Proportional to 459.48, 689.09 and 134.78

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Solution

The fourth proportional to 459.48, 689.09 and 134.78 is: 202.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.48 : 689.09 = 134.78 : x
  2. Step 2: Convert to fraction form
    459.48/689.09 = 134.78/x
  3. Step 3: Cross multiply
    459.48x = 689.09 × 134.78
  4. Step 4: Simplify right side
    459.48x = 92,871.43
  5. Step 5: Solve for x
    x = 92,871.43/459.48
  6. Step 6: Final answer
    x = 202.12

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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.