Home / 81,490.40-122,235.60-78,768.80

Finding the Fourth Proportional to 81,490.40, 122,235.60 and 78,768.80

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Solution

The fourth proportional to 81,490.40, 122,235.60 and 78,768.80 is: 118,153.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.40 : 122,235.60 = 78,768.80 : x
  2. Step 2: Convert to fraction form
    81,490.40/122,235.60 = 78,768.80/x
  3. Step 3: Cross multiply
    81,490.40x = 122,235.60 × 78,768.80
  4. Step 4: Simplify right side
    81,490.40x = 9,628,351,529.28
  5. Step 5: Solve for x
    x = 9,628,351,529.28/81,490.40
  6. Step 6: Final answer
    x = 118,153.20

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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.