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Finding the Fourth Proportional to 621.06, 854.34 and 519.57

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Solution

The fourth proportional to 621.06, 854.34 and 519.57 is: 714.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.06 : 854.34 = 519.57 : x
  2. Step 2: Convert to fraction form
    621.06/854.34 = 519.57/x
  3. Step 3: Cross multiply
    621.06x = 854.34 × 519.57
  4. Step 4: Simplify right side
    621.06x = 443,886.84
  5. Step 5: Solve for x
    x = 443,886.84/621.06
  6. Step 6: Final answer
    x = 714.72

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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.