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Finding the Fourth Proportional to 30,940.79, 42,699.02 and 18,997.34

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Solution

The fourth proportional to 30,940.79, 42,699.02 and 18,997.34 is: 26,216.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,940.79 : 42,699.02 = 18,997.34 : x
  2. Step 2: Convert to fraction form
    30,940.79/42,699.02 = 18,997.34/x
  3. Step 3: Cross multiply
    30,940.79x = 42,699.02 × 18,997.34
  4. Step 4: Simplify right side
    30,940.79x = 811,167,492.13
  5. Step 5: Solve for x
    x = 811,167,492.13/30,940.79
  6. Step 6: Final answer
    x = 26,216.77

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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.