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Finding the Fourth Proportional to 213,081.80, 319,401.30 and 86,667.80

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Solution

The fourth proportional to 213,081.80, 319,401.30 and 86,667.80 is: 129,911.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,081.80 : 319,401.30 = 86,667.80 : x
  2. Step 2: Convert to fraction form
    213,081.80/319,401.30 = 86,667.80/x
  3. Step 3: Cross multiply
    213,081.80x = 319,401.30 × 86,667.80
  4. Step 4: Simplify right side
    213,081.80x = 27,681,807,988.14
  5. Step 5: Solve for x
    x = 27,681,807,988.14/213,081.80
  6. Step 6: Final answer
    x = 129,911.65

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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.