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Finding the Fourth Proportional to 70,368.85, 105,560.20 and 20,449.39

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Solution

The fourth proportional to 70,368.85, 105,560.20 and 20,449.39 is: 30,676.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,368.85 : 105,560.20 = 20,449.39 : x
  2. Step 2: Convert to fraction form
    70,368.85/105,560.20 = 20,449.39/x
  3. Step 3: Cross multiply
    70,368.85x = 105,560.20 × 20,449.39
  4. Step 4: Simplify right side
    70,368.85x = 2,158,641,170.48
  5. Step 5: Solve for x
    x = 2,158,641,170.48/70,368.85
  6. Step 6: Final answer
    x = 30,676.09

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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.