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Finding the Fourth Proportional to 1,388.79, 2,082.77 and 511.09

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Solution

The fourth proportional to 1,388.79, 2,082.77 and 511.09 is: 766.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.79 : 2,082.77 = 511.09 : x
  2. Step 2: Convert to fraction form
    1,388.79/2,082.77 = 511.09/x
  3. Step 3: Cross multiply
    1,388.79x = 2,082.77 × 511.09
  4. Step 4: Simplify right side
    1,388.79x = 1,064,482.92
  5. Step 5: Solve for x
    x = 1,064,482.92/1,388.79
  6. Step 6: Final answer
    x = 766.48

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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.