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Finding the Fourth Proportional to 1,387,370, 2,081,055.81 and 390,098

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Solution

The fourth proportional to 1,387,370, 2,081,055.81 and 390,098 is: 585,147.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,370 : 2,081,055.81 = 390,098 : x
  2. Step 2: Convert to fraction form
    1,387,370/2,081,055.81 = 390,098/x
  3. Step 3: Cross multiply
    1,387,370x = 2,081,055.81 × 390,098
  4. Step 4: Simplify right side
    1,387,370x = 811,815,709,369.38
  5. Step 5: Solve for x
    x = 811,815,709,369.38/1,387,370
  6. Step 6: Final answer
    x = 585,147.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.