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Finding the Fourth Proportional to 2,720.40, 3,754.14 and 1,478.40

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Solution

The fourth proportional to 2,720.40, 3,754.14 and 1,478.40 is: 2,040.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.40 : 3,754.14 = 1,478.40 : x
  2. Step 2: Convert to fraction form
    2,720.40/3,754.14 = 1,478.40/x
  3. Step 3: Cross multiply
    2,720.40x = 3,754.14 × 1,478.40
  4. Step 4: Simplify right side
    2,720.40x = 5,550,120.58
  5. Step 5: Solve for x
    x = 5,550,120.58/2,720.40
  6. Step 6: Final answer
    x = 2,040.19

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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.