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Finding the Fourth Proportional to 219,807.20, 329,710.80 and 86,643.20

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Solution

The fourth proportional to 219,807.20, 329,710.80 and 86,643.20 is: 129,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,807.20 : 329,710.80 = 86,643.20 : x
  2. Step 2: Convert to fraction form
    219,807.20/329,710.80 = 86,643.20/x
  3. Step 3: Cross multiply
    219,807.20x = 329,710.80 × 86,643.20
  4. Step 4: Simplify right side
    219,807.20x = 28,567,198,786.56
  5. Step 5: Solve for x
    x = 28,567,198,786.56/219,807.20
  6. Step 6: Final answer
    x = 129,964.80

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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.