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Finding the Fourth Proportional to 720.86, 995.27 and 554.78

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Solution

The fourth proportional to 720.86, 995.27 and 554.78 is: 765.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.86 : 995.27 = 554.78 : x
  2. Step 2: Convert to fraction form
    720.86/995.27 = 554.78/x
  3. Step 3: Cross multiply
    720.86x = 995.27 × 554.78
  4. Step 4: Simplify right side
    720.86x = 552,153.12
  5. Step 5: Solve for x
    x = 552,153.12/720.86
  6. Step 6: Final answer
    x = 765.96

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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.