Home / 1,386.11-1,911.92-1,053.78

Finding the Fourth Proportional to 1,386.11, 1,911.92 and 1,053.78

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Solution

The fourth proportional to 1,386.11, 1,911.92 and 1,053.78 is: 1,453.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.11 : 1,911.92 = 1,053.78 : x
  2. Step 2: Convert to fraction form
    1,386.11/1,911.92 = 1,053.78/x
  3. Step 3: Cross multiply
    1,386.11x = 1,911.92 × 1,053.78
  4. Step 4: Simplify right side
    1,386.11x = 2,014,737.79
  5. Step 5: Solve for x
    x = 2,014,737.79/1,386.11
  6. Step 6: Final answer
    x = 1,453.52

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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.