Home / 2,928.60-4,040.21-1,985.15

Finding the Fourth Proportional to 2,928.60, 4,040.21 and 1,985.15

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Solution

The fourth proportional to 2,928.60, 4,040.21 and 1,985.15 is: 2,738.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928.60 : 4,040.21 = 1,985.15 : x
  2. Step 2: Convert to fraction form
    2,928.60/4,040.21 = 1,985.15/x
  3. Step 3: Cross multiply
    2,928.60x = 4,040.21 × 1,985.15
  4. Step 4: Simplify right side
    2,928.60x = 8,020,437.94
  5. Step 5: Solve for x
    x = 8,020,437.94/2,928.60
  6. Step 6: Final answer
    x = 2,738.66

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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.