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Finding the Fourth Proportional to 479.88, 661.14 and 400.86

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Solution

The fourth proportional to 479.88, 661.14 and 400.86 is: 552.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.88 : 661.14 = 400.86 : x
  2. Step 2: Convert to fraction form
    479.88/661.14 = 400.86/x
  3. Step 3: Cross multiply
    479.88x = 661.14 × 400.86
  4. Step 4: Simplify right side
    479.88x = 265,024.58
  5. Step 5: Solve for x
    x = 265,024.58/479.88
  6. Step 6: Final answer
    x = 552.27

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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.