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Finding the Fourth Proportional to 1,387,365, 2,081,048.31 and 390,093

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Solution

The fourth proportional to 1,387,365, 2,081,048.31 and 390,093 is: 585,139.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,365 : 2,081,048.31 = 390,093 : x
  2. Step 2: Convert to fraction form
    1,387,365/2,081,048.31 = 390,093/x
  3. Step 3: Cross multiply
    1,387,365x = 2,081,048.31 × 390,093
  4. Step 4: Simplify right side
    1,387,365x = 811,802,378,392.83
  5. Step 5: Solve for x
    x = 811,802,378,392.83/1,387,365
  6. Step 6: Final answer
    x = 585,139.73

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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.