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Finding the Fourth Proportional to 70,821.60, 106,232.40 and 39,328.80

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Solution

The fourth proportional to 70,821.60, 106,232.40 and 39,328.80 is: 58,993.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,821.60 : 106,232.40 = 39,328.80 : x
  2. Step 2: Convert to fraction form
    70,821.60/106,232.40 = 39,328.80/x
  3. Step 3: Cross multiply
    70,821.60x = 106,232.40 × 39,328.80
  4. Step 4: Simplify right side
    70,821.60x = 4,177,992,813.12
  5. Step 5: Solve for x
    x = 4,177,992,813.12/70,821.60
  6. Step 6: Final answer
    x = 58,993.20

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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.