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Finding the Fourth Proportional to 720.99, 1,081.62 and 355.59

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Solution

The fourth proportional to 720.99, 1,081.62 and 355.59 is: 533.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.99 : 1,081.62 = 355.59 : x
  2. Step 2: Convert to fraction form
    720.99/1,081.62 = 355.59/x
  3. Step 3: Cross multiply
    720.99x = 1,081.62 × 355.59
  4. Step 4: Simplify right side
    720.99x = 384,613.26
  5. Step 5: Solve for x
    x = 384,613.26/720.99
  6. Step 6: Final answer
    x = 533.45

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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.