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Finding the Fourth Proportional to 30,698.39, 42,339.77 and 19,946.72

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Solution

The fourth proportional to 30,698.39, 42,339.77 and 19,946.72 is: 27,510.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,698.39 : 42,339.77 = 19,946.72 : x
  2. Step 2: Convert to fraction form
    30,698.39/42,339.77 = 19,946.72/x
  3. Step 3: Cross multiply
    30,698.39x = 42,339.77 × 19,946.72
  4. Step 4: Simplify right side
    30,698.39x = 844,539,537.05
  5. Step 5: Solve for x
    x = 844,539,537.05/30,698.39
  6. Step 6: Final answer
    x = 27,510.88

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.