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Finding the Fourth Proportional to 70,286.52, 105,429.51 and 28,185.42

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Solution

The fourth proportional to 70,286.52, 105,429.51 and 28,185.42 is: 42,278.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,286.52 : 105,429.51 = 28,185.42 : x
  2. Step 2: Convert to fraction form
    70,286.52/105,429.51 = 28,185.42/x
  3. Step 3: Cross multiply
    70,286.52x = 105,429.51 × 28,185.42
  4. Step 4: Simplify right side
    70,286.52x = 2,971,575,019.74
  5. Step 5: Solve for x
    x = 2,971,575,019.74/70,286.52
  6. Step 6: Final answer
    x = 42,278.02

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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.