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Finding the Fourth Proportional to 1,389,783.67, 1,917,933.95 and 777,921.22

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Solution

The fourth proportional to 1,389,783.67, 1,917,933.95 and 777,921.22 is: 1,073,549.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,783.67 : 1,917,933.95 = 777,921.22 : x
  2. Step 2: Convert to fraction form
    1,389,783.67/1,917,933.95 = 777,921.22/x
  3. Step 3: Cross multiply
    1,389,783.67x = 1,917,933.95 × 777,921.22
  4. Step 4: Simplify right side
    1,389,783.67x = 1,492,001,504,784.14
  5. Step 5: Solve for x
    x = 1,492,001,504,784.14/1,389,783.67
  6. Step 6: Final answer
    x = 1,073,549.46

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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.