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Finding the Fourth Proportional to 265.46, 398.21 and 103.15

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Solution

The fourth proportional to 265.46, 398.21 and 103.15 is: 154.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.46 : 398.21 = 103.15 : x
  2. Step 2: Convert to fraction form
    265.46/398.21 = 103.15/x
  3. Step 3: Cross multiply
    265.46x = 398.21 × 103.15
  4. Step 4: Simplify right side
    265.46x = 41,075.54
  5. Step 5: Solve for x
    x = 41,075.54/265.46
  6. Step 6: Final answer
    x = 154.74

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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.