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Finding the Fourth Proportional to 720.54, 995.00 and 621.36

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Solution

The fourth proportional to 720.54, 995.00 and 621.36 is: 858.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.54 : 995.00 = 621.36 : x
  2. Step 2: Convert to fraction form
    720.54/995.00 = 621.36/x
  3. Step 3: Cross multiply
    720.54x = 995.00 × 621.36
  4. Step 4: Simplify right side
    720.54x = 618,250.09
  5. Step 5: Solve for x
    x = 618,250.09/720.54
  6. Step 6: Final answer
    x = 858.04

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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.