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Finding the Fourth Proportional to 70,281.75, 105,437.21 and 28,728.75

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Solution

The fourth proportional to 70,281.75, 105,437.21 and 28,728.75 is: 43,099.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,281.75 : 105,437.21 = 28,728.75 : x
  2. Step 2: Convert to fraction form
    70,281.75/105,437.21 = 28,728.75/x
  3. Step 3: Cross multiply
    70,281.75x = 105,437.21 × 28,728.75
  4. Step 4: Simplify right side
    70,281.75x = 3,029,079,103.14
  5. Step 5: Solve for x
    x = 3,029,079,103.14/70,281.75
  6. Step 6: Final answer
    x = 43,099.08

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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.