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Finding the Fourth Proportional to 1,890.11, 2,836.18 and 916.21

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Solution

The fourth proportional to 1,890.11, 2,836.18 and 916.21 is: 1,374.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.11 : 2,836.18 = 916.21 : x
  2. Step 2: Convert to fraction form
    1,890.11/2,836.18 = 916.21/x
  3. Step 3: Cross multiply
    1,890.11x = 2,836.18 × 916.21
  4. Step 4: Simplify right side
    1,890.11x = 2,598,531.14
  5. Step 5: Solve for x
    x = 2,598,531.14/1,890.11
  6. Step 6: Final answer
    x = 1,374.81

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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.