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Finding the Fourth Proportional to 479.19, 661.38 and 313.55

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Solution

The fourth proportional to 479.19, 661.38 and 313.55 is: 432.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.19 : 661.38 = 313.55 : x
  2. Step 2: Convert to fraction form
    479.19/661.38 = 313.55/x
  3. Step 3: Cross multiply
    479.19x = 661.38 × 313.55
  4. Step 4: Simplify right side
    479.19x = 207,372.39
  5. Step 5: Solve for x
    x = 207,372.39/479.19
  6. Step 6: Final answer
    x = 432.76

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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.