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Finding the Fourth Proportional to 459.87, 689.94 and 171.51

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Solution

The fourth proportional to 459.87, 689.94 and 171.51 is: 257.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.87 : 689.94 = 171.51 : x
  2. Step 2: Convert to fraction form
    459.87/689.94 = 171.51/x
  3. Step 3: Cross multiply
    459.87x = 689.94 × 171.51
  4. Step 4: Simplify right side
    459.87x = 118,331.61
  5. Step 5: Solve for x
    x = 118,331.61/459.87
  6. Step 6: Final answer
    x = 257.32

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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.