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Finding the Fourth Proportional to 235.99, 325.65 and 129.64

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Solution

The fourth proportional to 235.99, 325.65 and 129.64 is: 178.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.99 : 325.65 = 129.64 : x
  2. Step 2: Convert to fraction form
    235.99/325.65 = 129.64/x
  3. Step 3: Cross multiply
    235.99x = 325.65 × 129.64
  4. Step 4: Simplify right side
    235.99x = 42,216.45
  5. Step 5: Solve for x
    x = 42,216.45/235.99
  6. Step 6: Final answer
    x = 178.89

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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.