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Finding the Fourth Proportional to 1,079.55, 1,619.28 and 820.06

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Solution

The fourth proportional to 1,079.55, 1,619.28 and 820.06 is: 1,230.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.55 : 1,619.28 = 820.06 : x
  2. Step 2: Convert to fraction form
    1,079.55/1,619.28 = 820.06/x
  3. Step 3: Cross multiply
    1,079.55x = 1,619.28 × 820.06
  4. Step 4: Simplify right side
    1,079.55x = 1,327,902.71
  5. Step 5: Solve for x
    x = 1,327,902.71/1,079.55
  6. Step 6: Final answer
    x = 1,230.05

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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.