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Finding the Fourth Proportional to 2,765.60, 4,148.80 and 916.80

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Solution

The fourth proportional to 2,765.60, 4,148.80 and 916.80 is: 1,375.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,765.60 : 4,148.80 = 916.80 : x
  2. Step 2: Convert to fraction form
    2,765.60/4,148.80 = 916.80/x
  3. Step 3: Cross multiply
    2,765.60x = 4,148.80 × 916.80
  4. Step 4: Simplify right side
    2,765.60x = 3,803,619.84
  5. Step 5: Solve for x
    x = 3,803,619.84/2,765.60
  6. Step 6: Final answer
    x = 1,375.33

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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.