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Finding the Fourth Proportional to 30,558.53, 42,170.41 and 17,129.77

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Solution

The fourth proportional to 30,558.53, 42,170.41 and 17,129.77 is: 23,638.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,558.53 : 42,170.41 = 17,129.77 : x
  2. Step 2: Convert to fraction form
    30,558.53/42,170.41 = 17,129.77/x
  3. Step 3: Cross multiply
    30,558.53x = 42,170.41 × 17,129.77
  4. Step 4: Simplify right side
    30,558.53x = 722,369,424.11
  5. Step 5: Solve for x
    x = 722,369,424.11/30,558.53
  6. Step 6: Final answer
    x = 23,638.88

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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.