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Finding the Fourth Proportional to 1,891.50, 2,835.22 and 915.45

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Solution

The fourth proportional to 1,891.50, 2,835.22 and 915.45 is: 1,372.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.50 : 2,835.22 = 915.45 : x
  2. Step 2: Convert to fraction form
    1,891.50/2,835.22 = 915.45/x
  3. Step 3: Cross multiply
    1,891.50x = 2,835.22 × 915.45
  4. Step 4: Simplify right side
    1,891.50x = 2,595,502.15
  5. Step 5: Solve for x
    x = 2,595,502.15/1,891.50
  6. Step 6: Final answer
    x = 1,372.19

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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.