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Finding the Fourth Proportional to 1,079.56, 1,619.62 and 386.30

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Solution

The fourth proportional to 1,079.56, 1,619.62 and 386.30 is: 579.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.56 : 1,619.62 = 386.30 : x
  2. Step 2: Convert to fraction form
    1,079.56/1,619.62 = 386.30/x
  3. Step 3: Cross multiply
    1,079.56x = 1,619.62 × 386.30
  4. Step 4: Simplify right side
    1,079.56x = 625,651.11
  5. Step 5: Solve for x
    x = 625,651.11/1,079.56
  6. Step 6: Final answer
    x = 579.55

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Double scale
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1.5x scale

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.