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Finding the Fourth Proportional to 479.55, 661.17 and 313.50

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Solution

The fourth proportional to 479.55, 661.17 and 313.50 is: 432.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.55 : 661.17 = 313.50 : x
  2. Step 2: Convert to fraction form
    479.55/661.17 = 313.50/x
  3. Step 3: Cross multiply
    479.55x = 661.17 × 313.50
  4. Step 4: Simplify right side
    479.55x = 207,275.85
  5. Step 5: Solve for x
    x = 207,275.85/479.55
  6. Step 6: Final answer
    x = 432.23

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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.