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Finding the Fourth Proportional to 219,015.80, 328,559.16 and 85,823.84

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Solution

The fourth proportional to 219,015.80, 328,559.16 and 85,823.84 is: 128,749.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,015.80 : 328,559.16 = 85,823.84 : x
  2. Step 2: Convert to fraction form
    219,015.80/328,559.16 = 85,823.84/x
  3. Step 3: Cross multiply
    219,015.80x = 328,559.16 × 85,823.84
  4. Step 4: Simplify right side
    219,015.80x = 28,198,208,778.37
  5. Step 5: Solve for x
    x = 28,198,208,778.37/219,015.80
  6. Step 6: Final answer
    x = 128,749.66

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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.