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Finding the Fourth Proportional to 1,389.33, 1,916.44 and 917.23

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Solution

The fourth proportional to 1,389.33, 1,916.44 and 917.23 is: 1,265.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.33 : 1,916.44 = 917.23 : x
  2. Step 2: Convert to fraction form
    1,389.33/1,916.44 = 917.23/x
  3. Step 3: Cross multiply
    1,389.33x = 1,916.44 × 917.23
  4. Step 4: Simplify right side
    1,389.33x = 1,757,809.18
  5. Step 5: Solve for x
    x = 1,757,809.18/1,389.33
  6. Step 6: Final answer
    x = 1,265.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.