Home / 1,389.36-2,071.29-1,279.74

Finding the Fourth Proportional to 1,389.36, 2,071.29 and 1,279.74

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Solution

The fourth proportional to 1,389.36, 2,071.29 and 1,279.74 is: 1,907.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.36 : 2,071.29 = 1,279.74 : x
  2. Step 2: Convert to fraction form
    1,389.36/2,071.29 = 1,279.74/x
  3. Step 3: Cross multiply
    1,389.36x = 2,071.29 × 1,279.74
  4. Step 4: Simplify right side
    1,389.36x = 2,650,712.66
  5. Step 5: Solve for x
    x = 2,650,712.66/1,389.36
  6. Step 6: Final answer
    x = 1,907.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.