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Finding the Fourth Proportional to 668.84, 922.79 and 389.02

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Solution

The fourth proportional to 668.84, 922.79 and 389.02 is: 536.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.84 : 922.79 = 389.02 : x
  2. Step 2: Convert to fraction form
    668.84/922.79 = 389.02/x
  3. Step 3: Cross multiply
    668.84x = 922.79 × 389.02
  4. Step 4: Simplify right side
    668.84x = 358,983.77
  5. Step 5: Solve for x
    x = 358,983.77/668.84
  6. Step 6: Final answer
    x = 536.73

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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.