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Finding the Fourth Proportional to 70,281.63, 105,422.54 and 28,728.63

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Solution

The fourth proportional to 70,281.63, 105,422.54 and 28,728.63 is: 43,092.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,281.63 : 105,422.54 = 28,728.63 : x
  2. Step 2: Convert to fraction form
    70,281.63/105,422.54 = 28,728.63/x
  3. Step 3: Cross multiply
    70,281.63x = 105,422.54 × 28,728.63
  4. Step 4: Simplify right side
    70,281.63x = 3,028,644,618.21
  5. Step 5: Solve for x
    x = 3,028,644,618.21/70,281.63
  6. Step 6: Final answer
    x = 43,092.98

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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.