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Finding the Fourth Proportional to 995.72, 1,373.90 and 553.54

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Solution

The fourth proportional to 995.72, 1,373.90 and 553.54 is: 763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.72 : 1,373.90 = 553.54 : x
  2. Step 2: Convert to fraction form
    995.72/1,373.90 = 553.54/x
  3. Step 3: Cross multiply
    995.72x = 1,373.90 × 553.54
  4. Step 4: Simplify right side
    995.72x = 760,508.61
  5. Step 5: Solve for x
    x = 760,508.61/995.72
  6. Step 6: Final answer
    x = 763.78

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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.