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Finding the Fourth Proportional to 1,781.64, 2,674.08 and 916.56

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Solution

The fourth proportional to 1,781.64, 2,674.08 and 916.56 is: 1,375.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.64 : 2,674.08 = 916.56 : x
  2. Step 2: Convert to fraction form
    1,781.64/2,674.08 = 916.56/x
  3. Step 3: Cross multiply
    1,781.64x = 2,674.08 × 916.56
  4. Step 4: Simplify right side
    1,781.64x = 2,450,954.76
  5. Step 5: Solve for x
    x = 2,450,954.76/1,781.64
  6. Step 6: Final answer
    x = 1,375.67

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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.