Home / 1,386.81-1,912.68-1,161.90

Finding the Fourth Proportional to 1,386.81, 1,912.68 and 1,161.90

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Solution

The fourth proportional to 1,386.81, 1,912.68 and 1,161.90 is: 1,602.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.81 : 1,912.68 = 1,161.90 : x
  2. Step 2: Convert to fraction form
    1,386.81/1,912.68 = 1,161.90/x
  3. Step 3: Cross multiply
    1,386.81x = 1,912.68 × 1,161.90
  4. Step 4: Simplify right side
    1,386.81x = 2,222,342.89
  5. Step 5: Solve for x
    x = 2,222,342.89/1,386.81
  6. Step 6: Final answer
    x = 1,602.49

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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.