Home / 1,289,221.38-1,779,231.42-831,289.23

Finding the Fourth Proportional to 1,289,221.38, 1,779,231.42 and 831,289.23

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Solution

The fourth proportional to 1,289,221.38, 1,779,231.42 and 831,289.23 is: 1,147,247.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289,221.38 : 1,779,231.42 = 831,289.23 : x
  2. Step 2: Convert to fraction form
    1,289,221.38/1,779,231.42 = 831,289.23/x
  3. Step 3: Cross multiply
    1,289,221.38x = 1,779,231.42 × 831,289.23
  4. Step 4: Simplify right side
    1,289,221.38x = 1,479,055,917,123.61
  5. Step 5: Solve for x
    x = 1,479,055,917,123.61/1,289,221.38
  6. Step 6: Final answer
    x = 1,147,247.43

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Double scale
Find fourth proportional to 1,289,222.38, 1,779,232.80 and 831,290.23
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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.