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Finding the Fourth Proportional to 70,388.48, 105,745.80 and 66,612.80

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Solution

The fourth proportional to 70,388.48, 105,745.80 and 66,612.80 is: 100,073.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,388.48 : 105,745.80 = 66,612.80 : x
  2. Step 2: Convert to fraction form
    70,388.48/105,745.80 = 66,612.80/x
  3. Step 3: Cross multiply
    70,388.48x = 105,745.80 × 66,612.80
  4. Step 4: Simplify right side
    70,388.48x = 7,044,023,826.24
  5. Step 5: Solve for x
    x = 7,044,023,826.24/70,388.48
  6. Step 6: Final answer
    x = 100,073.53

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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.