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Finding the Fourth Proportional to 1,286, 1,775.06 and 1,139.12

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Solution

The fourth proportional to 1,286, 1,775.06 and 1,139.12 is: 1,572.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286 : 1,775.06 = 1,139.12 : x
  2. Step 2: Convert to fraction form
    1,286/1,775.06 = 1,139.12/x
  3. Step 3: Cross multiply
    1,286x = 1,775.06 × 1,139.12
  4. Step 4: Simplify right side
    1,286x = 2,022,006.35
  5. Step 5: Solve for x
    x = 2,022,006.35/1,286
  6. Step 6: Final answer
    x = 1,572.32

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Double scale
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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.