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Finding the Fourth Proportional to 978,609.80, 1,467,914.70 and 812,721.80

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Solution

The fourth proportional to 978,609.80, 1,467,914.70 and 812,721.80 is: 1,219,082.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,609.80 : 1,467,914.70 = 812,721.80 : x
  2. Step 2: Convert to fraction form
    978,609.80/1,467,914.70 = 812,721.80/x
  3. Step 3: Cross multiply
    978,609.80x = 1,467,914.70 × 812,721.80
  4. Step 4: Simplify right side
    978,609.80x = 1,193,006,277,230.46
  5. Step 5: Solve for x
    x = 1,193,006,277,230.46/978,609.80
  6. Step 6: Final answer
    x = 1,219,082.70

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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.