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Finding the Fourth Proportional to 3,159.95, 4,361.65 and 1,980.99

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Solution

The fourth proportional to 3,159.95, 4,361.65 and 1,980.99 is: 2,734.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,159.95 : 4,361.65 = 1,980.99 : x
  2. Step 2: Convert to fraction form
    3,159.95/4,361.65 = 1,980.99/x
  3. Step 3: Cross multiply
    3,159.95x = 4,361.65 × 1,980.99
  4. Step 4: Simplify right side
    3,159.95x = 8,640,380.08
  5. Step 5: Solve for x
    x = 8,640,380.08/3,159.95
  6. Step 6: Final answer
    x = 2,734.35

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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.