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Finding the Fourth Proportional to 486.77, 671.27 and 393.45

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Solution

The fourth proportional to 486.77, 671.27 and 393.45 is: 542.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.77 : 671.27 = 393.45 : x
  2. Step 2: Convert to fraction form
    486.77/671.27 = 393.45/x
  3. Step 3: Cross multiply
    486.77x = 671.27 × 393.45
  4. Step 4: Simplify right side
    486.77x = 264,111.88
  5. Step 5: Solve for x
    x = 264,111.88/486.77
  6. Step 6: Final answer
    x = 542.58

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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.