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Finding the Fourth Proportional to 1,388.39, 2,082.18 and 657.77

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Solution

The fourth proportional to 1,388.39, 2,082.18 and 657.77 is: 986.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.39 : 2,082.18 = 657.77 : x
  2. Step 2: Convert to fraction form
    1,388.39/2,082.18 = 657.77/x
  3. Step 3: Cross multiply
    1,388.39x = 2,082.18 × 657.77
  4. Step 4: Simplify right side
    1,388.39x = 1,369,595.54
  5. Step 5: Solve for x
    x = 1,369,595.54/1,388.39
  6. Step 6: Final answer
    x = 986.46

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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.