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Finding the Fourth Proportional to 429.00, 643.54 and 120.86

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Solution

The fourth proportional to 429.00, 643.54 and 120.86 is: 181.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.00 : 643.54 = 120.86 : x
  2. Step 2: Convert to fraction form
    429.00/643.54 = 120.86/x
  3. Step 3: Cross multiply
    429.00x = 643.54 × 120.86
  4. Step 4: Simplify right side
    429.00x = 77,779.51
  5. Step 5: Solve for x
    x = 77,779.51/429.00
  6. Step 6: Final answer
    x = 181.30

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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.