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Finding the Fourth Proportional to 978,186.20, 1,371,949 and 978,186.20

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Solution

The fourth proportional to 978,186.20, 1,371,949 and 978,186.20 is: 1,371,949

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,186.20 : 1,371,949 = 978,186.20 : x
  2. Step 2: Convert to fraction form
    978,186.20/1,371,949 = 978,186.20/x
  3. Step 3: Cross multiply
    978,186.20x = 1,371,949 × 978,186.20
  4. Step 4: Simplify right side
    978,186.20x = 1,342,021,578,903.80
  5. Step 5: Solve for x
    x = 1,342,021,578,903.80/978,186.20
  6. Step 6: Final answer
    x = 1,371,949

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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.