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Finding the Fourth Proportional to 219,009.78, 328,550.16 and 85,817.82

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Solution

The fourth proportional to 219,009.78, 328,550.16 and 85,817.82 is: 128,740.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,009.78 : 328,550.16 = 85,817.82 : x
  2. Step 2: Convert to fraction form
    219,009.78/328,550.16 = 85,817.82/x
  3. Step 3: Cross multiply
    219,009.78x = 328,550.16 × 85,817.82
  4. Step 4: Simplify right side
    219,009.78x = 28,195,458,491.85
  5. Step 5: Solve for x
    x = 28,195,458,491.85/219,009.78
  6. Step 6: Final answer
    x = 128,740.64

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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.