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Finding the Fourth Proportional to 548.17, 818.64 and 487.69

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Solution

The fourth proportional to 548.17, 818.64 and 487.69 is: 728.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.17 : 818.64 = 487.69 : x
  2. Step 2: Convert to fraction form
    548.17/818.64 = 487.69/x
  3. Step 3: Cross multiply
    548.17x = 818.64 × 487.69
  4. Step 4: Simplify right side
    548.17x = 399,238.67
  5. Step 5: Solve for x
    x = 399,238.67/548.17
  6. Step 6: Final answer
    x = 728.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.