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Finding the Fourth Proportional to 219,469.20, 329,203.80 and 86,305.20

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Solution

The fourth proportional to 219,469.20, 329,203.80 and 86,305.20 is: 129,457.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,469.20 : 329,203.80 = 86,305.20 : x
  2. Step 2: Convert to fraction form
    219,469.20/329,203.80 = 86,305.20/x
  3. Step 3: Cross multiply
    219,469.20x = 329,203.80 × 86,305.20
  4. Step 4: Simplify right side
    219,469.20x = 28,411,999,799.76
  5. Step 5: Solve for x
    x = 28,411,999,799.76/219,469.20
  6. Step 6: Final answer
    x = 129,457.80

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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.