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Finding the Fourth Proportional to 720.60, 1,080.18 and 355.65

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Solution

The fourth proportional to 720.60, 1,080.18 and 355.65 is: 533.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.60 : 1,080.18 = 355.65 : x
  2. Step 2: Convert to fraction form
    720.60/1,080.18 = 355.65/x
  3. Step 3: Cross multiply
    720.60x = 1,080.18 × 355.65
  4. Step 4: Simplify right side
    720.60x = 384,166.02
  5. Step 5: Solve for x
    x = 384,166.02/720.60
  6. Step 6: Final answer
    x = 533.12

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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.