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Finding the Fourth Proportional to 720.95, 1,081.77 and 355.54

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Solution

The fourth proportional to 720.95, 1,081.77 and 355.54 is: 533.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.95 : 1,081.77 = 355.54 : x
  2. Step 2: Convert to fraction form
    720.95/1,081.77 = 355.54/x
  3. Step 3: Cross multiply
    720.95x = 1,081.77 × 355.54
  4. Step 4: Simplify right side
    720.95x = 384,611.00
  5. Step 5: Solve for x
    x = 384,611.00/720.95
  6. Step 6: Final answer
    x = 533.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.