Home / 1,391.76-2,071.26-1,339.92

Finding the Fourth Proportional to 1,391.76, 2,071.26 and 1,339.92

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Solution

The fourth proportional to 1,391.76, 2,071.26 and 1,339.92 is: 1,994.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.76 : 2,071.26 = 1,339.92 : x
  2. Step 2: Convert to fraction form
    1,391.76/2,071.26 = 1,339.92/x
  3. Step 3: Cross multiply
    1,391.76x = 2,071.26 × 1,339.92
  4. Step 4: Simplify right side
    1,391.76x = 2,775,322.70
  5. Step 5: Solve for x
    x = 2,775,322.70/1,391.76
  6. Step 6: Final answer
    x = 1,994.11

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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.