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Finding the Fourth Proportional to 212,805.92, 318,645.73 and 128,453.33

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Solution

The fourth proportional to 212,805.92, 318,645.73 and 128,453.33 is: 192,340.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,805.92 : 318,645.73 = 128,453.33 : x
  2. Step 2: Convert to fraction form
    212,805.92/318,645.73 = 128,453.33/x
  3. Step 3: Cross multiply
    212,805.92x = 318,645.73 × 128,453.33
  4. Step 4: Simplify right side
    212,805.92x = 40,931,105,108.78
  5. Step 5: Solve for x
    x = 40,931,105,108.78/212,805.92
  6. Step 6: Final answer
    x = 192,340.07

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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.