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Finding the Fourth Proportional to 721.26, 994.95 and 511.74

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Solution

The fourth proportional to 721.26, 994.95 and 511.74 is: 705.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.26 : 994.95 = 511.74 : x
  2. Step 2: Convert to fraction form
    721.26/994.95 = 511.74/x
  3. Step 3: Cross multiply
    721.26x = 994.95 × 511.74
  4. Step 4: Simplify right side
    721.26x = 509,155.71
  5. Step 5: Solve for x
    x = 509,155.71/721.26
  6. Step 6: Final answer
    x = 705.93

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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.