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Finding the Fourth Proportional to 722.90, 995.28 and 612.20

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Solution

The fourth proportional to 722.90, 995.28 and 612.20 is: 842.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.90 : 995.28 = 612.20 : x
  2. Step 2: Convert to fraction form
    722.90/995.28 = 612.20/x
  3. Step 3: Cross multiply
    722.90x = 995.28 × 612.20
  4. Step 4: Simplify right side
    722.90x = 609,310.42
  5. Step 5: Solve for x
    x = 609,310.42/722.90
  6. Step 6: Final answer
    x = 842.87

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1.5x scale

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.