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Finding the Fourth Proportional to 668.98, 922.93 and 389.17

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Solution

The fourth proportional to 668.98, 922.93 and 389.17 is: 536.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.98 : 922.93 = 389.17 : x
  2. Step 2: Convert to fraction form
    668.98/922.93 = 389.17/x
  3. Step 3: Cross multiply
    668.98x = 922.93 × 389.17
  4. Step 4: Simplify right side
    668.98x = 359,176.67
  5. Step 5: Solve for x
    x = 359,176.67/668.98
  6. Step 6: Final answer
    x = 536.90

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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.