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Finding the Fourth Proportional to 389.89, 538.14 and 265.60

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Solution

The fourth proportional to 389.89, 538.14 and 265.60 is: 366.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.89 : 538.14 = 265.60 : x
  2. Step 2: Convert to fraction form
    389.89/538.14 = 265.60/x
  3. Step 3: Cross multiply
    389.89x = 538.14 × 265.60
  4. Step 4: Simplify right side
    389.89x = 142,929.98
  5. Step 5: Solve for x
    x = 142,929.98/389.89
  6. Step 6: Final answer
    x = 366.59

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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.