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Finding the Fourth Proportional to 621.76, 857.60 and 548

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Solution

The fourth proportional to 621.76, 857.60 and 548 is: 755.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.76 : 857.60 = 548 : x
  2. Step 2: Convert to fraction form
    621.76/857.60 = 548/x
  3. Step 3: Cross multiply
    621.76x = 857.60 × 548
  4. Step 4: Simplify right side
    621.76x = 469,964.80
  5. Step 5: Solve for x
    x = 469,964.80/621.76
  6. Step 6: Final answer
    x = 755.86

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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.