Home / 2,215.49-3,055.80-1,428.78

Finding the Fourth Proportional to 2,215.49, 3,055.80 and 1,428.78

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Solution

The fourth proportional to 2,215.49, 3,055.80 and 1,428.78 is: 1,970.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,215.49 : 3,055.80 = 1,428.78 : x
  2. Step 2: Convert to fraction form
    2,215.49/3,055.80 = 1,428.78/x
  3. Step 3: Cross multiply
    2,215.49x = 3,055.80 × 1,428.78
  4. Step 4: Simplify right side
    2,215.49x = 4,366,065.92
  5. Step 5: Solve for x
    x = 4,366,065.92/2,215.49
  6. Step 6: Final answer
    x = 1,970.70

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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.