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Finding the Fourth Proportional to 459.08, 632.78 and 311.66

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Solution

The fourth proportional to 459.08, 632.78 and 311.66 is: 429.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.08 : 632.78 = 311.66 : x
  2. Step 2: Convert to fraction form
    459.08/632.78 = 311.66/x
  3. Step 3: Cross multiply
    459.08x = 632.78 × 311.66
  4. Step 4: Simplify right side
    459.08x = 197,207.49
  5. Step 5: Solve for x
    x = 197,207.49/459.08
  6. Step 6: Final answer
    x = 429.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.