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Finding the Fourth Proportional to 1,386.13, 1,912.85 and 765.13

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Solution

The fourth proportional to 1,386.13, 1,912.85 and 765.13 is: 1,055.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.13 : 1,912.85 = 765.13 : x
  2. Step 2: Convert to fraction form
    1,386.13/1,912.85 = 765.13/x
  3. Step 3: Cross multiply
    1,386.13x = 1,912.85 × 765.13
  4. Step 4: Simplify right side
    1,386.13x = 1,463,578.92
  5. Step 5: Solve for x
    x = 1,463,578.92/1,386.13
  6. Step 6: Final answer
    x = 1,055.87

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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.