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Finding the Fourth Proportional to 915.15, 1,371.99 and 816.51

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Solution

The fourth proportional to 915.15, 1,371.99 and 816.51 is: 1,224.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.15 : 1,371.99 = 816.51 : x
  2. Step 2: Convert to fraction form
    915.15/1,371.99 = 816.51/x
  3. Step 3: Cross multiply
    915.15x = 1,371.99 × 816.51
  4. Step 4: Simplify right side
    915.15x = 1,120,243.55
  5. Step 5: Solve for x
    x = 1,120,243.55/915.15
  6. Step 6: Final answer
    x = 1,224.11

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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.