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Finding the Fourth Proportional to 978,210.20, 1,371,982.60 and 978,210.20

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Solution

The fourth proportional to 978,210.20, 1,371,982.60 and 978,210.20 is: 1,371,982.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,210.20 : 1,371,982.60 = 978,210.20 : x
  2. Step 2: Convert to fraction form
    978,210.20/1,371,982.60 = 978,210.20/x
  3. Step 3: Cross multiply
    978,210.20x = 1,371,982.60 × 978,210.20
  4. Step 4: Simplify right side
    978,210.20x = 1,342,087,373,542.52
  5. Step 5: Solve for x
    x = 1,342,087,373,542.52/978,210.20
  6. Step 6: Final answer
    x = 1,371,982.60

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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.