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Finding the Fourth Proportional to 668.58, 922.55 and 388.86

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Solution

The fourth proportional to 668.58, 922.55 and 388.86 is: 536.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.58 : 922.55 = 388.86 : x
  2. Step 2: Convert to fraction form
    668.58/922.55 = 388.86/x
  3. Step 3: Cross multiply
    668.58x = 922.55 × 388.86
  4. Step 4: Simplify right side
    668.58x = 358,742.79
  5. Step 5: Solve for x
    x = 358,742.79/668.58
  6. Step 6: Final answer
    x = 536.57

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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.