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Finding the Fourth Proportional to 720, 995.22 and 621.54

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Solution

The fourth proportional to 720, 995.22 and 621.54 is: 859.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 995.22 = 621.54 : x
  2. Step 2: Convert to fraction form
    720/995.22 = 621.54/x
  3. Step 3: Cross multiply
    720x = 995.22 × 621.54
  4. Step 4: Simplify right side
    720x = 618,569.04
  5. Step 5: Solve for x
    x = 618,569.04/720
  6. Step 6: Final answer
    x = 859.12

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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.