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Finding the Fourth Proportional to 479.25, 661.10 and 313.43

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Solution

The fourth proportional to 479.25, 661.10 and 313.43 is: 432.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.25 : 661.10 = 313.43 : x
  2. Step 2: Convert to fraction form
    479.25/661.10 = 313.43/x
  3. Step 3: Cross multiply
    479.25x = 661.10 × 313.43
  4. Step 4: Simplify right side
    479.25x = 207,203.70
  5. Step 5: Solve for x
    x = 207,203.70/479.25
  6. Step 6: Final answer
    x = 432.35

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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.