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Finding the Fourth Proportional to 70,380.71, 105,581.36 and 20,454.30

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Solution

The fourth proportional to 70,380.71, 105,581.36 and 20,454.30 is: 30,684.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,380.71 : 105,581.36 = 20,454.30 : x
  2. Step 2: Convert to fraction form
    70,380.71/105,581.36 = 20,454.30/x
  3. Step 3: Cross multiply
    70,380.71x = 105,581.36 × 20,454.30
  4. Step 4: Simplify right side
    70,380.71x = 2,159,592,709.58
  5. Step 5: Solve for x
    x = 2,159,592,709.58/70,380.71
  6. Step 6: Final answer
    x = 30,684.44

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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.