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Finding the Fourth Proportional to 1,079.90, 1,620 and 386.37

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Solution

The fourth proportional to 1,079.90, 1,620 and 386.37 is: 579.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.90 : 1,620 = 386.37 : x
  2. Step 2: Convert to fraction form
    1,079.90/1,620 = 386.37/x
  3. Step 3: Cross multiply
    1,079.90x = 1,620 × 386.37
  4. Step 4: Simplify right side
    1,079.90x = 625,919.40
  5. Step 5: Solve for x
    x = 625,919.40/1,079.90
  6. Step 6: Final answer
    x = 579.61

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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.