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Finding the Fourth Proportional to 978,105.40, 1,366,548.20 and 978,105.40

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Solution

The fourth proportional to 978,105.40, 1,366,548.20 and 978,105.40 is: 1,366,548.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,105.40 : 1,366,548.20 = 978,105.40 : x
  2. Step 2: Convert to fraction form
    978,105.40/1,366,548.20 = 978,105.40/x
  3. Step 3: Cross multiply
    978,105.40x = 1,366,548.20 × 978,105.40
  4. Step 4: Simplify right side
    978,105.40x = 1,336,628,173,780.28
  5. Step 5: Solve for x
    x = 1,336,628,173,780.28/978,105.40
  6. Step 6: Final answer
    x = 1,366,548.20

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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.