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Finding the Fourth Proportional to 668.51, 922.21 and 500.84

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Solution

The fourth proportional to 668.51, 922.21 and 500.84 is: 690.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.51 : 922.21 = 500.84 : x
  2. Step 2: Convert to fraction form
    668.51/922.21 = 500.84/x
  3. Step 3: Cross multiply
    668.51x = 922.21 × 500.84
  4. Step 4: Simplify right side
    668.51x = 461,879.66
  5. Step 5: Solve for x
    x = 461,879.66/668.51
  6. Step 6: Final answer
    x = 690.91

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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.