Home / 1,390.95-1,928.30-1,316.97

Finding the Fourth Proportional to 1,390.95, 1,928.30 and 1,316.97

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Solution

The fourth proportional to 1,390.95, 1,928.30 and 1,316.97 is: 1,825.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.95 : 1,928.30 = 1,316.97 : x
  2. Step 2: Convert to fraction form
    1,390.95/1,928.30 = 1,316.97/x
  3. Step 3: Cross multiply
    1,390.95x = 1,928.30 × 1,316.97
  4. Step 4: Simplify right side
    1,390.95x = 2,539,506.67
  5. Step 5: Solve for x
    x = 2,539,506.67/1,390.95
  6. Step 6: Final answer
    x = 1,825.74

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.