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Finding the Fourth Proportional to 486.45, 671.30 and 265.40

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Solution

The fourth proportional to 486.45, 671.30 and 265.40 is: 366.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.45 : 671.30 = 265.40 : x
  2. Step 2: Convert to fraction form
    486.45/671.30 = 265.40/x
  3. Step 3: Cross multiply
    486.45x = 671.30 × 265.40
  4. Step 4: Simplify right side
    486.45x = 178,163.02
  5. Step 5: Solve for x
    x = 178,163.02/486.45
  6. Step 6: Final answer
    x = 366.25

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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.