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Finding the Fourth Proportional to 215,667.15, 297,642.81 and 129,653.97

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Solution

The fourth proportional to 215,667.15, 297,642.81 and 129,653.97 is: 178,935.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,667.15 : 297,642.81 = 129,653.97 : x
  2. Step 2: Convert to fraction form
    215,667.15/297,642.81 = 129,653.97/x
  3. Step 3: Cross multiply
    215,667.15x = 297,642.81 × 129,653.97
  4. Step 4: Simplify right side
    215,667.15x = 38,590,571,310.19
  5. Step 5: Solve for x
    x = 38,590,571,310.19/215,667.15
  6. Step 6: Final answer
    x = 178,935.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.