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Finding the Fourth Proportional to 386,320.80, 579,481.20 and 120,079.20

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Solution

The fourth proportional to 386,320.80, 579,481.20 and 120,079.20 is: 180,118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,320.80 : 579,481.20 = 120,079.20 : x
  2. Step 2: Convert to fraction form
    386,320.80/579,481.20 = 120,079.20/x
  3. Step 3: Cross multiply
    386,320.80x = 579,481.20 × 120,079.20
  4. Step 4: Simplify right side
    386,320.80x = 69,583,638,911.04
  5. Step 5: Solve for x
    x = 69,583,638,911.04/386,320.80
  6. Step 6: Final answer
    x = 180,118.80

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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.