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Finding the Fourth Proportional to 721.02, 995.43 and 554.91

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Solution

The fourth proportional to 721.02, 995.43 and 554.91 is: 766.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.02 : 995.43 = 554.91 : x
  2. Step 2: Convert to fraction form
    721.02/995.43 = 554.91/x
  3. Step 3: Cross multiply
    721.02x = 995.43 × 554.91
  4. Step 4: Simplify right side
    721.02x = 552,374.06
  5. Step 5: Solve for x
    x = 552,374.06/721.02
  6. Step 6: Final answer
    x = 766.10

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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.