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Finding the Fourth Proportional to 1,388.48, 1,916.11 and 759.00

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Solution

The fourth proportional to 1,388.48, 1,916.11 and 759.00 is: 1,047.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.48 : 1,916.11 = 759.00 : x
  2. Step 2: Convert to fraction form
    1,388.48/1,916.11 = 759.00/x
  3. Step 3: Cross multiply
    1,388.48x = 1,916.11 × 759.00
  4. Step 4: Simplify right side
    1,388.48x = 1,454,314.11
  5. Step 5: Solve for x
    x = 1,454,314.11/1,388.48
  6. Step 6: Final answer
    x = 1,047.42

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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.