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Finding the Fourth Proportional to 379,615.80, 569,642.40 and 143,128.20

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Solution

The fourth proportional to 379,615.80, 569,642.40 and 143,128.20 is: 214,774.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    379,615.80 : 569,642.40 = 143,128.20 : x
  2. Step 2: Convert to fraction form
    379,615.80/569,642.40 = 143,128.20/x
  3. Step 3: Cross multiply
    379,615.80x = 569,642.40 × 143,128.20
  4. Step 4: Simplify right side
    379,615.80x = 81,531,891,355.68
  5. Step 5: Solve for x
    x = 81,531,891,355.68/379,615.80
  6. Step 6: Final answer
    x = 214,774.76

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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.