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Finding the Fourth Proportional to 668.51, 922.74 and 388.81

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Solution

The fourth proportional to 668.51, 922.74 and 388.81 is: 536.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.51 : 922.74 = 388.81 : x
  2. Step 2: Convert to fraction form
    668.51/922.74 = 388.81/x
  3. Step 3: Cross multiply
    668.51x = 922.74 × 388.81
  4. Step 4: Simplify right side
    668.51x = 358,768.23
  5. Step 5: Solve for x
    x = 358,768.23/668.51
  6. Step 6: Final answer
    x = 536.67

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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.