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Finding the Fourth Proportional to 265.48, 397.86 and 143.80

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Solution

The fourth proportional to 265.48, 397.86 and 143.80 is: 215.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.48 : 397.86 = 143.80 : x
  2. Step 2: Convert to fraction form
    265.48/397.86 = 143.80/x
  3. Step 3: Cross multiply
    265.48x = 397.86 × 143.80
  4. Step 4: Simplify right side
    265.48x = 57,212.27
  5. Step 5: Solve for x
    x = 57,212.27/265.48
  6. Step 6: Final answer
    x = 215.51

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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.