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Finding the Fourth Proportional to 978,290.80, 1,467,436.20 and 659,426.20

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Solution

The fourth proportional to 978,290.80, 1,467,436.20 and 659,426.20 is: 989,139.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,290.80 : 1,467,436.20 = 659,426.20 : x
  2. Step 2: Convert to fraction form
    978,290.80/1,467,436.20 = 659,426.20/x
  3. Step 3: Cross multiply
    978,290.80x = 1,467,436.20 × 659,426.20
  4. Step 4: Simplify right side
    978,290.80x = 967,665,877,108.44
  5. Step 5: Solve for x
    x = 967,665,877,108.44/978,290.80
  6. Step 6: Final answer
    x = 989,139.30

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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.