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Finding the Fourth Proportional to 459.48, 633.70 and 311.86

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Solution

The fourth proportional to 459.48, 633.70 and 311.86 is: 430.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.48 : 633.70 = 311.86 : x
  2. Step 2: Convert to fraction form
    459.48/633.70 = 311.86/x
  3. Step 3: Cross multiply
    459.48x = 633.70 × 311.86
  4. Step 4: Simplify right side
    459.48x = 197,625.68
  5. Step 5: Solve for x
    x = 197,625.68/459.48
  6. Step 6: Final answer
    x = 430.11

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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.