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Finding the Fourth Proportional to 621.79, 860.19 and 511.04

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Solution

The fourth proportional to 621.79, 860.19 and 511.04 is: 706.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.79 : 860.19 = 511.04 : x
  2. Step 2: Convert to fraction form
    621.79/860.19 = 511.04/x
  3. Step 3: Cross multiply
    621.79x = 860.19 × 511.04
  4. Step 4: Simplify right side
    621.79x = 439,591.73
  5. Step 5: Solve for x
    x = 439,591.73/621.79
  6. Step 6: Final answer
    x = 706.98

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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.