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Finding the Fourth Proportional to 1,355.13, 2,030.36 and 915.41

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Solution

The fourth proportional to 1,355.13, 2,030.36 and 915.41 is: 1,371.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.13 : 2,030.36 = 915.41 : x
  2. Step 2: Convert to fraction form
    1,355.13/2,030.36 = 915.41/x
  3. Step 3: Cross multiply
    1,355.13x = 2,030.36 × 915.41
  4. Step 4: Simplify right side
    1,355.13x = 1,858,611.85
  5. Step 5: Solve for x
    x = 1,858,611.85/1,355.13
  6. Step 6: Final answer
    x = 1,371.54

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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.