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Finding the Fourth Proportional to 418.02, 626.64 and 157.86

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Solution

The fourth proportional to 418.02, 626.64 and 157.86 is: 236.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.02 : 626.64 = 157.86 : x
  2. Step 2: Convert to fraction form
    418.02/626.64 = 157.86/x
  3. Step 3: Cross multiply
    418.02x = 626.64 × 157.86
  4. Step 4: Simplify right side
    418.02x = 98,921.39
  5. Step 5: Solve for x
    x = 98,921.39/418.02
  6. Step 6: Final answer
    x = 236.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.