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Finding the Fourth Proportional to 70,436.54, 105,672.09 and 20,517.10

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Solution

The fourth proportional to 70,436.54, 105,672.09 and 20,517.10 is: 30,780.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,436.54 : 105,672.09 = 20,517.10 : x
  2. Step 2: Convert to fraction form
    70,436.54/105,672.09 = 20,517.10/x
  3. Step 3: Cross multiply
    70,436.54x = 105,672.09 × 20,517.10
  4. Step 4: Simplify right side
    70,436.54x = 2,168,084,650.50
  5. Step 5: Solve for x
    x = 2,168,084,650.50/70,436.54
  6. Step 6: Final answer
    x = 30,780.68

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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.