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Finding the Fourth Proportional to 1,080.63, 1,620.79 and 616.90

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Solution

The fourth proportional to 1,080.63, 1,620.79 and 616.90 is: 925.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.63 : 1,620.79 = 616.90 : x
  2. Step 2: Convert to fraction form
    1,080.63/1,620.79 = 616.90/x
  3. Step 3: Cross multiply
    1,080.63x = 1,620.79 × 616.90
  4. Step 4: Simplify right side
    1,080.63x = 999,865.83
  5. Step 5: Solve for x
    x = 999,865.83/1,080.63
  6. Step 6: Final answer
    x = 925.27

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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.