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Finding the Fourth Proportional to 721.36, 995.96 and 555.28

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Solution

The fourth proportional to 721.36, 995.96 and 555.28 is: 766.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.36 : 995.96 = 555.28 : x
  2. Step 2: Convert to fraction form
    721.36/995.96 = 555.28/x
  3. Step 3: Cross multiply
    721.36x = 995.96 × 555.28
  4. Step 4: Simplify right side
    721.36x = 553,036.67
  5. Step 5: Solve for x
    x = 553,036.67/721.36
  6. Step 6: Final answer
    x = 766.66

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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.