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Finding the Fourth Proportional to 219,990.17, 329,986.47 and 79,745.15

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Solution

The fourth proportional to 219,990.17, 329,986.47 and 79,745.15 is: 119,618.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,990.17 : 329,986.47 = 79,745.15 : x
  2. Step 2: Convert to fraction form
    219,990.17/329,986.47 = 79,745.15/x
  3. Step 3: Cross multiply
    219,990.17x = 329,986.47 × 79,745.15
  4. Step 4: Simplify right side
    219,990.17x = 26,314,820,548.12
  5. Step 5: Solve for x
    x = 26,314,820,548.12/219,990.17
  6. Step 6: Final answer
    x = 119,618.17

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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.