Home / 1,389,648.42-1,916,191.89-905,315.40

Finding the Fourth Proportional to 1,389,648.42, 1,916,191.89 and 905,315.40

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Solution

The fourth proportional to 1,389,648.42, 1,916,191.89 and 905,315.40 is: 1,248,343.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,648.42 : 1,916,191.89 = 905,315.40 : x
  2. Step 2: Convert to fraction form
    1,389,648.42/1,916,191.89 = 905,315.40/x
  3. Step 3: Cross multiply
    1,389,648.42x = 1,916,191.89 × 905,315.40
  4. Step 4: Simplify right side
    1,389,648.42x = 1,734,758,027,372.11
  5. Step 5: Solve for x
    x = 1,734,758,027,372.11/1,389,648.42
  6. Step 6: Final answer
    x = 1,248,343.11

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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.