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Finding the Fourth Proportional to 620.66, 857.18 and 482.43

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Solution

The fourth proportional to 620.66, 857.18 and 482.43 is: 666.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.66 : 857.18 = 482.43 : x
  2. Step 2: Convert to fraction form
    620.66/857.18 = 482.43/x
  3. Step 3: Cross multiply
    620.66x = 857.18 × 482.43
  4. Step 4: Simplify right side
    620.66x = 413,526.94
  5. Step 5: Solve for x
    x = 413,526.94/620.66
  6. Step 6: Final answer
    x = 666.28

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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.