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Finding the Fourth Proportional to 920.99, 1,371.61 and 915.73

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Solution

The fourth proportional to 920.99, 1,371.61 and 915.73 is: 1,363.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.99 : 1,371.61 = 915.73 : x
  2. Step 2: Convert to fraction form
    920.99/1,371.61 = 915.73/x
  3. Step 3: Cross multiply
    920.99x = 1,371.61 × 915.73
  4. Step 4: Simplify right side
    920.99x = 1,256,024.43
  5. Step 5: Solve for x
    x = 1,256,024.43/920.99
  6. Step 6: Final answer
    x = 1,363.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.