Home / 1,389,608.72-1,916,137.23-905,275.70

Finding the Fourth Proportional to 1,389,608.72, 1,916,137.23 and 905,275.70

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Solution

The fourth proportional to 1,389,608.72, 1,916,137.23 and 905,275.70 is: 1,248,288.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,608.72 : 1,916,137.23 = 905,275.70 : x
  2. Step 2: Convert to fraction form
    1,389,608.72/1,916,137.23 = 905,275.70/x
  3. Step 3: Cross multiply
    1,389,608.72x = 1,916,137.23 × 905,275.70
  4. Step 4: Simplify right side
    1,389,608.72x = 1,734,632,474,711.47
  5. Step 5: Solve for x
    x = 1,734,632,474,711.47/1,389,608.72
  6. Step 6: Final answer
    x = 1,248,288.42

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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.