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Finding the Fourth Proportional to 2,918.79, 4,378.40 and 838.77

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Solution

The fourth proportional to 2,918.79, 4,378.40 and 838.77 is: 1,258.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,918.79 : 4,378.40 = 838.77 : x
  2. Step 2: Convert to fraction form
    2,918.79/4,378.40 = 838.77/x
  3. Step 3: Cross multiply
    2,918.79x = 4,378.40 × 838.77
  4. Step 4: Simplify right side
    2,918.79x = 3,672,470.57
  5. Step 5: Solve for x
    x = 3,672,470.57/2,918.79
  6. Step 6: Final answer
    x = 1,258.22

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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.