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Finding the Fourth Proportional to 70,436.42, 105,671.84 and 20,515.71

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Solution

The fourth proportional to 70,436.42, 105,671.84 and 20,515.71 is: 30,778.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,436.42 : 105,671.84 = 20,515.71 : x
  2. Step 2: Convert to fraction form
    70,436.42/105,671.84 = 20,515.71/x
  3. Step 3: Cross multiply
    70,436.42x = 105,671.84 × 20,515.71
  4. Step 4: Simplify right side
    70,436.42x = 2,167,932,722.03
  5. Step 5: Solve for x
    x = 2,167,932,722.03/70,436.42
  6. Step 6: Final answer
    x = 30,778.58

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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.