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Finding the Fourth Proportional to 978,219.20, 1,370,440 and 978,219.20

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Solution

The fourth proportional to 978,219.20, 1,370,440 and 978,219.20 is: 1,370,440

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,219.20 : 1,370,440 = 978,219.20 : x
  2. Step 2: Convert to fraction form
    978,219.20/1,370,440 = 978,219.20/x
  3. Step 3: Cross multiply
    978,219.20x = 1,370,440 × 978,219.20
  4. Step 4: Simplify right side
    978,219.20x = 1,340,590,720,448
  5. Step 5: Solve for x
    x = 1,340,590,720,448/978,219.20
  6. Step 6: Final answer
    x = 1,370,440

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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.