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Finding the Fourth Proportional to 70,388.81, 105,596.50 and 28,272.20

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Solution

The fourth proportional to 70,388.81, 105,596.50 and 28,272.20 is: 42,413.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,388.81 : 105,596.50 = 28,272.20 : x
  2. Step 2: Convert to fraction form
    70,388.81/105,596.50 = 28,272.20/x
  3. Step 3: Cross multiply
    70,388.81x = 105,596.50 × 28,272.20
  4. Step 4: Simplify right side
    70,388.81x = 2,985,444,768.64
  5. Step 5: Solve for x
    x = 2,985,444,768.64/70,388.81
  6. Step 6: Final answer
    x = 42,413.63

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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.