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Finding the Fourth Proportional to 651, 898 and 389

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Solution

The fourth proportional to 651, 898 and 389 is: 536.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    651 : 898 = 389 : x
  2. Step 2: Convert to fraction form
    651/898 = 389/x
  3. Step 3: Cross multiply
    651x = 898 × 389
  4. Step 4: Simplify right side
    651x = 349,322
  5. Step 5: Solve for x
    x = 349,322/651
  6. Step 6: Final answer
    x = 536.59

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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.