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Finding the Fourth Proportional to 1,878.74, 2,816.19 and 853.46

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Solution

The fourth proportional to 1,878.74, 2,816.19 and 853.46 is: 1,279.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.74 : 2,816.19 = 853.46 : x
  2. Step 2: Convert to fraction form
    1,878.74/2,816.19 = 853.46/x
  3. Step 3: Cross multiply
    1,878.74x = 2,816.19 × 853.46
  4. Step 4: Simplify right side
    1,878.74x = 2,403,505.52
  5. Step 5: Solve for x
    x = 2,403,505.52/1,878.74
  6. Step 6: Final answer
    x = 1,279.32

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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.