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Finding the Fourth Proportional to 1,386.46, 2,081.05 and 839.71

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Solution

The fourth proportional to 1,386.46, 2,081.05 and 839.71 is: 1,260.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.46 : 2,081.05 = 839.71 : x
  2. Step 2: Convert to fraction form
    1,386.46/2,081.05 = 839.71/x
  3. Step 3: Cross multiply
    1,386.46x = 2,081.05 × 839.71
  4. Step 4: Simplify right side
    1,386.46x = 1,747,475.51
  5. Step 5: Solve for x
    x = 1,747,475.51/1,386.46
  6. Step 6: Final answer
    x = 1,260.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.