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Finding the Fourth Proportional to 215,711.80, 323,567.70 and 136,979.80

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Solution

The fourth proportional to 215,711.80, 323,567.70 and 136,979.80 is: 205,469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,711.80 : 323,567.70 = 136,979.80 : x
  2. Step 2: Convert to fraction form
    215,711.80/323,567.70 = 136,979.80/x
  3. Step 3: Cross multiply
    215,711.80x = 323,567.70 × 136,979.80
  4. Step 4: Simplify right side
    215,711.80x = 44,322,238,832.46
  5. Step 5: Solve for x
    x = 44,322,238,832.46/215,711.80
  6. Step 6: Final answer
    x = 205,469.70

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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.