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Finding the Fourth Proportional to 1,388.93, 2,082.02 and 649.31

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Solution

The fourth proportional to 1,388.93, 2,082.02 and 649.31 is: 973.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.93 : 2,082.02 = 649.31 : x
  2. Step 2: Convert to fraction form
    1,388.93/2,082.02 = 649.31/x
  3. Step 3: Cross multiply
    1,388.93x = 2,082.02 × 649.31
  4. Step 4: Simplify right side
    1,388.93x = 1,351,862.75
  5. Step 5: Solve for x
    x = 1,351,862.75/1,388.93
  6. Step 6: Final answer
    x = 973.32

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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.