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Finding the Fourth Proportional to 1,800.80, 2,485.48 and 1,055.12

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Solution

The fourth proportional to 1,800.80, 2,485.48 and 1,055.12 is: 1,456.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,800.80 : 2,485.48 = 1,055.12 : x
  2. Step 2: Convert to fraction form
    1,800.80/2,485.48 = 1,055.12/x
  3. Step 3: Cross multiply
    1,800.80x = 2,485.48 × 1,055.12
  4. Step 4: Simplify right side
    1,800.80x = 2,622,479.66
  5. Step 5: Solve for x
    x = 2,622,479.66/1,800.80
  6. Step 6: Final answer
    x = 1,456.29

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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.