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Finding the Fourth Proportional to 721.12, 995.62 and 555.04

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Solution

The fourth proportional to 721.12, 995.62 and 555.04 is: 766.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.12 : 995.62 = 555.04 : x
  2. Step 2: Convert to fraction form
    721.12/995.62 = 555.04/x
  3. Step 3: Cross multiply
    721.12x = 995.62 × 555.04
  4. Step 4: Simplify right side
    721.12x = 552,608.92
  5. Step 5: Solve for x
    x = 552,608.92/721.12
  6. Step 6: Final answer
    x = 766.32

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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.