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Finding the Fourth Proportional to 1,079.20, 1,619.02 and 617.20

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Solution

The fourth proportional to 1,079.20, 1,619.02 and 617.20 is: 925.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.20 : 1,619.02 = 617.20 : x
  2. Step 2: Convert to fraction form
    1,079.20/1,619.02 = 617.20/x
  3. Step 3: Cross multiply
    1,079.20x = 1,619.02 × 617.20
  4. Step 4: Simplify right side
    1,079.20x = 999,259.14
  5. Step 5: Solve for x
    x = 999,259.14/1,079.20
  6. Step 6: Final answer
    x = 925.93

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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.