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Finding the Fourth Proportional to 1,389.34, 2,082.48 and 657.82

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Solution

The fourth proportional to 1,389.34, 2,082.48 and 657.82 is: 986.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.34 : 2,082.48 = 657.82 : x
  2. Step 2: Convert to fraction form
    1,389.34/2,082.48 = 657.82/x
  3. Step 3: Cross multiply
    1,389.34x = 2,082.48 × 657.82
  4. Step 4: Simplify right side
    1,389.34x = 1,369,896.99
  5. Step 5: Solve for x
    x = 1,369,896.99/1,389.34
  6. Step 6: Final answer
    x = 986.01

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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.