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Finding the Fourth Proportional to 472.78, 651.86 and 394.21

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Solution

The fourth proportional to 472.78, 651.86 and 394.21 is: 543.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.78 : 651.86 = 394.21 : x
  2. Step 2: Convert to fraction form
    472.78/651.86 = 394.21/x
  3. Step 3: Cross multiply
    472.78x = 651.86 × 394.21
  4. Step 4: Simplify right side
    472.78x = 256,966.47
  5. Step 5: Solve for x
    x = 256,966.47/472.78
  6. Step 6: Final answer
    x = 543.53

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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.