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Finding the Fourth Proportional to 379,616.80, 569,643.90 and 143,129.20

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Solution

The fourth proportional to 379,616.80, 569,643.90 and 143,129.20 is: 214,776.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,616.80 : 569,643.90 = 143,129.20 : x
  2. Step 2: Convert to fraction form
    379,616.80/569,643.90 = 143,129.20/x
  3. Step 3: Cross multiply
    379,616.80x = 569,643.90 × 143,129.20
  4. Step 4: Simplify right side
    379,616.80x = 81,532,675,691.88
  5. Step 5: Solve for x
    x = 81,532,675,691.88/379,616.80
  6. Step 6: Final answer
    x = 214,776.26

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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.