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Finding the Fourth Proportional to 978,212.90, 1,366,698.70 and 978,212.90

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Solution

The fourth proportional to 978,212.90, 1,366,698.70 and 978,212.90 is: 1,366,698.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,212.90 : 1,366,698.70 = 978,212.90 : x
  2. Step 2: Convert to fraction form
    978,212.90/1,366,698.70 = 978,212.90/x
  3. Step 3: Cross multiply
    978,212.90x = 1,366,698.70 × 978,212.90
  4. Step 4: Simplify right side
    978,212.90x = 1,336,922,298,753.23
  5. Step 5: Solve for x
    x = 1,336,922,298,753.23/978,212.90
  6. Step 6: Final answer
    x = 1,366,698.70

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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.