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Finding the Fourth Proportional to 19,671.69, 29,485.67 and 7,978.53

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Solution

The fourth proportional to 19,671.69, 29,485.67 and 7,978.53 is: 11,958.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,671.69 : 29,485.67 = 7,978.53 : x
  2. Step 2: Convert to fraction form
    19,671.69/29,485.67 = 7,978.53/x
  3. Step 3: Cross multiply
    19,671.69x = 29,485.67 × 7,978.53
  4. Step 4: Simplify right side
    19,671.69x = 235,252,262.77
  5. Step 5: Solve for x
    x = 235,252,262.77/19,671.69
  6. Step 6: Final answer
    x = 11,958.92

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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.