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Finding the Fourth Proportional to 429.60, 643.77 and 186

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Solution

The fourth proportional to 429.60, 643.77 and 186 is: 278.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.60 : 643.77 = 186 : x
  2. Step 2: Convert to fraction form
    429.60/643.77 = 186/x
  3. Step 3: Cross multiply
    429.60x = 643.77 × 186
  4. Step 4: Simplify right side
    429.60x = 119,741.22
  5. Step 5: Solve for x
    x = 119,741.22/429.60
  6. Step 6: Final answer
    x = 278.73

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