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Finding the Fourth Proportional to 978,421.20, 1,467,631.80 and 810,131.55

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Solution

The fourth proportional to 978,421.20, 1,467,631.80 and 810,131.55 is: 1,215,197.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,421.20 : 1,467,631.80 = 810,131.55 : x
  2. Step 2: Convert to fraction form
    978,421.20/1,467,631.80 = 810,131.55/x
  3. Step 3: Cross multiply
    978,421.20x = 1,467,631.80 × 810,131.55
  4. Step 4: Simplify right side
    978,421.20x = 1,188,974,824,963.29
  5. Step 5: Solve for x
    x = 1,188,974,824,963.29/978,421.20
  6. Step 6: Final answer
    x = 1,215,197.33

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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.