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Finding the Fourth Proportional to 721.88, 995.40 and 556.51

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Solution

The fourth proportional to 721.88, 995.40 and 556.51 is: 767.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.88 : 995.40 = 556.51 : x
  2. Step 2: Convert to fraction form
    721.88/995.40 = 556.51/x
  3. Step 3: Cross multiply
    721.88x = 995.40 × 556.51
  4. Step 4: Simplify right side
    721.88x = 553,947.57
  5. Step 5: Solve for x
    x = 553,947.57/721.88
  6. Step 6: Final answer
    x = 767.37

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Double scale
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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.