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Finding the Fourth Proportional to 459.47, 689.21 and 170.91

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Solution

The fourth proportional to 459.47, 689.21 and 170.91 is: 256.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.47 : 689.21 = 170.91 : x
  2. Step 2: Convert to fraction form
    459.47/689.21 = 170.91/x
  3. Step 3: Cross multiply
    459.47x = 689.21 × 170.91
  4. Step 4: Simplify right side
    459.47x = 117,793.31
  5. Step 5: Solve for x
    x = 117,793.31/459.47
  6. Step 6: Final answer
    x = 256.37

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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.