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Finding the Fourth Proportional to 1,389.02, 1,916.84 and 759.60

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Solution

The fourth proportional to 1,389.02, 1,916.84 and 759.60 is: 1,048.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.02 : 1,916.84 = 759.60 : x
  2. Step 2: Convert to fraction form
    1,389.02/1,916.84 = 759.60/x
  3. Step 3: Cross multiply
    1,389.02x = 1,916.84 × 759.60
  4. Step 4: Simplify right side
    1,389.02x = 1,456,037.16
  5. Step 5: Solve for x
    x = 1,456,037.16/1,389.02
  6. Step 6: Final answer
    x = 1,048.25

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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.