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Finding the Fourth Proportional to 1,390,786.45, 1,918,673.92 and 839,194.48

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Solution

The fourth proportional to 1,390,786.45, 1,918,673.92 and 839,194.48 is: 1,157,719.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,786.45 : 1,918,673.92 = 839,194.48 : x
  2. Step 2: Convert to fraction form
    1,390,786.45/1,918,673.92 = 839,194.48/x
  3. Step 3: Cross multiply
    1,390,786.45x = 1,918,673.92 × 839,194.48
  4. Step 4: Simplify right side
    1,390,786.45x = 1,610,140,558,387.99
  5. Step 5: Solve for x
    x = 1,610,140,558,387.99/1,390,786.45
  6. Step 6: Final answer
    x = 1,157,719.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.