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Finding the Fourth Proportional to 215,814.40, 323,721.60 and 208,556.80

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Solution

The fourth proportional to 215,814.40, 323,721.60 and 208,556.80 is: 312,835.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,814.40 : 323,721.60 = 208,556.80 : x
  2. Step 2: Convert to fraction form
    215,814.40/323,721.60 = 208,556.80/x
  3. Step 3: Cross multiply
    215,814.40x = 323,721.60 × 208,556.80
  4. Step 4: Simplify right side
    215,814.40x = 67,514,340,986.88
  5. Step 5: Solve for x
    x = 67,514,340,986.88/215,814.40
  6. Step 6: Final answer
    x = 312,835.20

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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.