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Finding the Fourth Proportional to 70,357.95, 105,542.43 and 20,438.88

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Solution

The fourth proportional to 70,357.95, 105,542.43 and 20,438.88 is: 30,659.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,357.95 : 105,542.43 = 20,438.88 : x
  2. Step 2: Convert to fraction form
    70,357.95/105,542.43 = 20,438.88/x
  3. Step 3: Cross multiply
    70,357.95x = 105,542.43 × 20,438.88
  4. Step 4: Simplify right side
    70,357.95x = 2,157,169,061.68
  5. Step 5: Solve for x
    x = 2,157,169,061.68/70,357.95
  6. Step 6: Final answer
    x = 30,659.92

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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.