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Finding the Fourth Proportional to 1,878.60, 2,816.68 and 838.56

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Solution

The fourth proportional to 1,878.60, 2,816.68 and 838.56 is: 1,257.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.60 : 2,816.68 = 838.56 : x
  2. Step 2: Convert to fraction form
    1,878.60/2,816.68 = 838.56/x
  3. Step 3: Cross multiply
    1,878.60x = 2,816.68 × 838.56
  4. Step 4: Simplify right side
    1,878.60x = 2,361,955.18
  5. Step 5: Solve for x
    x = 2,361,955.18/1,878.60
  6. Step 6: Final answer
    x = 1,257.30

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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.