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Finding the Fourth Proportional to 459.80, 689.74 and 171.16

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Solution

The fourth proportional to 459.80, 689.74 and 171.16 is: 256.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.80 : 689.74 = 171.16 : x
  2. Step 2: Convert to fraction form
    459.80/689.74 = 171.16/x
  3. Step 3: Cross multiply
    459.80x = 689.74 × 171.16
  4. Step 4: Simplify right side
    459.80x = 118,055.90
  5. Step 5: Solve for x
    x = 118,055.90/459.80
  6. Step 6: Final answer
    x = 256.75

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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.