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Finding the Fourth Proportional to 70,422.67, 105,651.33 and 20,503.20

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Solution

The fourth proportional to 70,422.67, 105,651.33 and 20,503.20 is: 30,759.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,422.67 : 105,651.33 = 20,503.20 : x
  2. Step 2: Convert to fraction form
    70,422.67/105,651.33 = 20,503.20/x
  3. Step 3: Cross multiply
    70,422.67x = 105,651.33 × 20,503.20
  4. Step 4: Simplify right side
    70,422.67x = 2,166,190,349.26
  5. Step 5: Solve for x
    x = 2,166,190,349.26/70,422.67
  6. Step 6: Final answer
    x = 30,759.84

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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.