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Finding the Fourth Proportional to 215,721.80, 323,525.10 and 65,961.80

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Solution

The fourth proportional to 215,721.80, 323,525.10 and 65,961.80 is: 98,925.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,721.80 : 323,525.10 = 65,961.80 : x
  2. Step 2: Convert to fraction form
    215,721.80/323,525.10 = 65,961.80/x
  3. Step 3: Cross multiply
    215,721.80x = 323,525.10 × 65,961.80
  4. Step 4: Simplify right side
    215,721.80x = 21,340,297,941.18
  5. Step 5: Solve for x
    x = 21,340,297,941.18/215,721.80
  6. Step 6: Final answer
    x = 98,925.09

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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.