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Finding the Fourth Proportional to 219,840.80, 329,617.20 and 86,640.80

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Solution

The fourth proportional to 219,840.80, 329,617.20 and 86,640.80 is: 129,904.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,840.80 : 329,617.20 = 86,640.80 : x
  2. Step 2: Convert to fraction form
    219,840.80/329,617.20 = 86,640.80/x
  3. Step 3: Cross multiply
    219,840.80x = 329,617.20 × 86,640.80
  4. Step 4: Simplify right side
    219,840.80x = 28,558,297,901.76
  5. Step 5: Solve for x
    x = 28,558,297,901.76/219,840.80
  6. Step 6: Final answer
    x = 129,904.45

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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.