Home / 1,853.80-2,780.70-1,643.20

Finding the Fourth Proportional to 1,853.80, 2,780.70 and 1,643.20

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Solution

The fourth proportional to 1,853.80, 2,780.70 and 1,643.20 is: 2,464.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.80 : 2,780.70 = 1,643.20 : x
  2. Step 2: Convert to fraction form
    1,853.80/2,780.70 = 1,643.20/x
  3. Step 3: Cross multiply
    1,853.80x = 2,780.70 × 1,643.20
  4. Step 4: Simplify right side
    1,853.80x = 4,569,246.24
  5. Step 5: Solve for x
    x = 4,569,246.24/1,853.80
  6. Step 6: Final answer
    x = 2,464.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.