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Finding the Fourth Proportional to 279,112.80, 391,282.80 and 279,112.80

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Solution

The fourth proportional to 279,112.80, 391,282.80 and 279,112.80 is: 391,282.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,112.80 : 391,282.80 = 279,112.80 : x
  2. Step 2: Convert to fraction form
    279,112.80/391,282.80 = 279,112.80/x
  3. Step 3: Cross multiply
    279,112.80x = 391,282.80 × 279,112.80
  4. Step 4: Simplify right side
    279,112.80x = 109,212,037,899.84
  5. Step 5: Solve for x
    x = 109,212,037,899.84/279,112.80
  6. Step 6: Final answer
    x = 391,282.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.