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Finding the Fourth Proportional to 389.51, 537.67 and 258.56

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Solution

The fourth proportional to 389.51, 537.67 and 258.56 is: 356.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.51 : 537.67 = 258.56 : x
  2. Step 2: Convert to fraction form
    389.51/537.67 = 258.56/x
  3. Step 3: Cross multiply
    389.51x = 537.67 × 258.56
  4. Step 4: Simplify right side
    389.51x = 139,019.96
  5. Step 5: Solve for x
    x = 139,019.96/389.51
  6. Step 6: Final answer
    x = 356.91

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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.