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Finding the Fourth Proportional to 626.64, 864.17 and 405.51

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Solution

The fourth proportional to 626.64, 864.17 and 405.51 is: 559.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.64 : 864.17 = 405.51 : x
  2. Step 2: Convert to fraction form
    626.64/864.17 = 405.51/x
  3. Step 3: Cross multiply
    626.64x = 864.17 × 405.51
  4. Step 4: Simplify right side
    626.64x = 350,425.83
  5. Step 5: Solve for x
    x = 350,425.83/626.64
  6. Step 6: Final answer
    x = 559.22

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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.