Home / 1,385.80-1,899.41-1,376.20

Finding the Fourth Proportional to 1,385.80, 1,899.41 and 1,376.20

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Solution

The fourth proportional to 1,385.80, 1,899.41 and 1,376.20 is: 1,886.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.80 : 1,899.41 = 1,376.20 : x
  2. Step 2: Convert to fraction form
    1,385.80/1,899.41 = 1,376.20/x
  3. Step 3: Cross multiply
    1,385.80x = 1,899.41 × 1,376.20
  4. Step 4: Simplify right side
    1,385.80x = 2,613,968.04
  5. Step 5: Solve for x
    x = 2,613,968.04/1,385.80
  6. Step 6: Final answer
    x = 1,886.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.