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Finding the Fourth Proportional to 721.09, 995.30 and 511.35

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Solution

The fourth proportional to 721.09, 995.30 and 511.35 is: 705.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.09 : 995.30 = 511.35 : x
  2. Step 2: Convert to fraction form
    721.09/995.30 = 511.35/x
  3. Step 3: Cross multiply
    721.09x = 995.30 × 511.35
  4. Step 4: Simplify right side
    721.09x = 508,946.66
  5. Step 5: Solve for x
    x = 508,946.66/721.09
  6. Step 6: Final answer
    x = 705.80

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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.