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Finding the Fourth Proportional to 978,081.40, 1,467,122.10 and 777,314.80

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Solution

The fourth proportional to 978,081.40, 1,467,122.10 and 777,314.80 is: 1,165,972.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,081.40 : 1,467,122.10 = 777,314.80 : x
  2. Step 2: Convert to fraction form
    978,081.40/1,467,122.10 = 777,314.80/x
  3. Step 3: Cross multiply
    978,081.40x = 1,467,122.10 × 777,314.80
  4. Step 4: Simplify right side
    978,081.40x = 1,140,415,721,737.08
  5. Step 5: Solve for x
    x = 1,140,415,721,737.08/978,081.40
  6. Step 6: Final answer
    x = 1,165,972.20

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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.