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Finding the Fourth Proportional to 265.81, 398.90 and 103.51

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Solution

The fourth proportional to 265.81, 398.90 and 103.51 is: 155.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.81 : 398.90 = 103.51 : x
  2. Step 2: Convert to fraction form
    265.81/398.90 = 103.51/x
  3. Step 3: Cross multiply
    265.81x = 398.90 × 103.51
  4. Step 4: Simplify right side
    265.81x = 41,290.14
  5. Step 5: Solve for x
    x = 41,290.14/265.81
  6. Step 6: Final answer
    x = 155.34

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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.