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Finding the Fourth Proportional to 978,081.20, 1,467,121.80 and 660,820.40

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Solution

The fourth proportional to 978,081.20, 1,467,121.80 and 660,820.40 is: 991,230.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,081.20 : 1,467,121.80 = 660,820.40 : x
  2. Step 2: Convert to fraction form
    978,081.20/1,467,121.80 = 660,820.40/x
  3. Step 3: Cross multiply
    978,081.20x = 1,467,121.80 × 660,820.40
  4. Step 4: Simplify right side
    978,081.20x = 969,504,014,724.72
  5. Step 5: Solve for x
    x = 969,504,014,724.72/978,081.20
  6. Step 6: Final answer
    x = 991,230.60

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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.