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Finding the Fourth Proportional to 1,377.12, 1,899.60 and 853.44

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Solution

The fourth proportional to 1,377.12, 1,899.60 and 853.44 is: 1,177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.12 : 1,899.60 = 853.44 : x
  2. Step 2: Convert to fraction form
    1,377.12/1,899.60 = 853.44/x
  3. Step 3: Cross multiply
    1,377.12x = 1,899.60 × 853.44
  4. Step 4: Simplify right side
    1,377.12x = 1,621,194.62
  5. Step 5: Solve for x
    x = 1,621,194.62/1,377.12
  6. Step 6: Final answer
    x = 1,177.24

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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.