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Finding the Fourth Proportional to 279,111.80, 391,281.40 and 279,111.80

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Solution

The fourth proportional to 279,111.80, 391,281.40 and 279,111.80 is: 391,281.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,111.80 : 391,281.40 = 279,111.80 : x
  2. Step 2: Convert to fraction form
    279,111.80/391,281.40 = 279,111.80/x
  3. Step 3: Cross multiply
    279,111.80x = 391,281.40 × 279,111.80
  4. Step 4: Simplify right side
    279,111.80x = 109,211,255,860.52
  5. Step 5: Solve for x
    x = 109,211,255,860.52/279,111.80
  6. Step 6: Final answer
    x = 391,281.40

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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.