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Finding the Fourth Proportional to 722.20, 995.61 and 485.74

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Solution

The fourth proportional to 722.20, 995.61 and 485.74 is: 669.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.20 : 995.61 = 485.74 : x
  2. Step 2: Convert to fraction form
    722.20/995.61 = 485.74/x
  3. Step 3: Cross multiply
    722.20x = 995.61 × 485.74
  4. Step 4: Simplify right side
    722.20x = 483,607.60
  5. Step 5: Solve for x
    x = 483,607.60/722.20
  6. Step 6: Final answer
    x = 669.63

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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.