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Finding the Fourth Proportional to 70,425.68, 105,655.84 and 20,506.20

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Solution

The fourth proportional to 70,425.68, 105,655.84 and 20,506.20 is: 30,764.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,425.68 : 105,655.84 = 20,506.20 : x
  2. Step 2: Convert to fraction form
    70,425.68/105,655.84 = 20,506.20/x
  3. Step 3: Cross multiply
    70,425.68x = 105,655.84 × 20,506.20
  4. Step 4: Simplify right side
    70,425.68x = 2,166,599,786.21
  5. Step 5: Solve for x
    x = 2,166,599,786.21/70,425.68
  6. Step 6: Final answer
    x = 30,764.34

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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.