Home / 1,389,090.06-1,916,376.98-905,478.75

Finding the Fourth Proportional to 1,389,090.06, 1,916,376.98 and 905,478.75

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Solution

The fourth proportional to 1,389,090.06, 1,916,376.98 and 905,478.75 is: 1,249,190.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,090.06 : 1,916,376.98 = 905,478.75 : x
  2. Step 2: Convert to fraction form
    1,389,090.06/1,916,376.98 = 905,478.75/x
  3. Step 3: Cross multiply
    1,389,090.06x = 1,916,376.98 × 905,478.75
  4. Step 4: Simplify right side
    1,389,090.06x = 1,735,238,627,851.78
  5. Step 5: Solve for x
    x = 1,735,238,627,851.78/1,389,090.06
  6. Step 6: Final answer
    x = 1,249,190.88

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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.