Home / 1,390.94-1,919.61-801.67

Finding the Fourth Proportional to 1,390.94, 1,919.61 and 801.67

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Solution

The fourth proportional to 1,390.94, 1,919.61 and 801.67 is: 1,106.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.94 : 1,919.61 = 801.67 : x
  2. Step 2: Convert to fraction form
    1,390.94/1,919.61 = 801.67/x
  3. Step 3: Cross multiply
    1,390.94x = 1,919.61 × 801.67
  4. Step 4: Simplify right side
    1,390.94x = 1,538,888.95
  5. Step 5: Solve for x
    x = 1,538,888.95/1,390.94
  6. Step 6: Final answer
    x = 1,106.36

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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.