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Finding the Fourth Proportional to 70,299.45, 105,446.10 and 20,378.46

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Solution

The fourth proportional to 70,299.45, 105,446.10 and 20,378.46 is: 30,566.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,299.45 : 105,446.10 = 20,378.46 : x
  2. Step 2: Convert to fraction form
    70,299.45/105,446.10 = 20,378.46/x
  3. Step 3: Cross multiply
    70,299.45x = 105,446.10 × 20,378.46
  4. Step 4: Simplify right side
    70,299.45x = 2,148,829,131.01
  5. Step 5: Solve for x
    x = 2,148,829,131.01/70,299.45
  6. Step 6: Final answer
    x = 30,566.80

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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.