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Finding the Fourth Proportional to 265.19, 397.78 and 72.81

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Solution

The fourth proportional to 265.19, 397.78 and 72.81 is: 109.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.19 : 397.78 = 72.81 : x
  2. Step 2: Convert to fraction form
    265.19/397.78 = 72.81/x
  3. Step 3: Cross multiply
    265.19x = 397.78 × 72.81
  4. Step 4: Simplify right side
    265.19x = 28,962.36
  5. Step 5: Solve for x
    x = 28,962.36/265.19
  6. Step 6: Final answer
    x = 109.21

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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.