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Finding the Fourth Proportional to 1,386.14, 1,912.02 and 826.22

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Solution

The fourth proportional to 1,386.14, 1,912.02 and 826.22 is: 1,139.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.14 : 1,912.02 = 826.22 : x
  2. Step 2: Convert to fraction form
    1,386.14/1,912.02 = 826.22/x
  3. Step 3: Cross multiply
    1,386.14x = 1,912.02 × 826.22
  4. Step 4: Simplify right side
    1,386.14x = 1,579,749.16
  5. Step 5: Solve for x
    x = 1,579,749.16/1,386.14
  6. Step 6: Final answer
    x = 1,139.68

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1.5x scale

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.