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Finding the Fourth Proportional to 914.40, 1,371.60 and 838.80

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Solution

The fourth proportional to 914.40, 1,371.60 and 838.80 is: 1,258.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.40 : 1,371.60 = 838.80 : x
  2. Step 2: Convert to fraction form
    914.40/1,371.60 = 838.80/x
  3. Step 3: Cross multiply
    914.40x = 1,371.60 × 838.80
  4. Step 4: Simplify right side
    914.40x = 1,150,498.08
  5. Step 5: Solve for x
    x = 1,150,498.08/914.40
  6. Step 6: Final answer
    x = 1,258.20

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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.