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Finding the Fourth Proportional to 978,217.70, 1,371,993.10 and 978,217.70

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Solution

The fourth proportional to 978,217.70, 1,371,993.10 and 978,217.70 is: 1,371,993.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,217.70 : 1,371,993.10 = 978,217.70 : x
  2. Step 2: Convert to fraction form
    978,217.70/1,371,993.10 = 978,217.70/x
  3. Step 3: Cross multiply
    978,217.70x = 1,371,993.10 × 978,217.70
  4. Step 4: Simplify right side
    978,217.70x = 1,342,107,934,697.87
  5. Step 5: Solve for x
    x = 1,342,107,934,697.87/978,217.70
  6. Step 6: Final answer
    x = 1,371,993.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.