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Finding the Fourth Proportional to 70,212.80, 105,229.60 and 28,612.80

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Solution

The fourth proportional to 70,212.80, 105,229.60 and 28,612.80 is: 42,882.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,212.80 : 105,229.60 = 28,612.80 : x
  2. Step 2: Convert to fraction form
    70,212.80/105,229.60 = 28,612.80/x
  3. Step 3: Cross multiply
    70,212.80x = 105,229.60 × 28,612.80
  4. Step 4: Simplify right side
    70,212.80x = 3,010,913,498.88
  5. Step 5: Solve for x
    x = 3,010,913,498.88/70,212.80
  6. Step 6: Final answer
    x = 42,882.69

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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.