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Finding the Fourth Proportional to 389.84, 538.12 and 259.12

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Solution

The fourth proportional to 389.84, 538.12 and 259.12 is: 357.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.84 : 538.12 = 259.12 : x
  2. Step 2: Convert to fraction form
    389.84/538.12 = 259.12/x
  3. Step 3: Cross multiply
    389.84x = 538.12 × 259.12
  4. Step 4: Simplify right side
    389.84x = 139,437.65
  5. Step 5: Solve for x
    x = 139,437.65/389.84
  6. Step 6: Final answer
    x = 357.68

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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.