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Finding the Fourth Proportional to 30,781.70, 42,457.62 and 18,850.94

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Solution

The fourth proportional to 30,781.70, 42,457.62 and 18,850.94 is: 26,001.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,781.70 : 42,457.62 = 18,850.94 : x
  2. Step 2: Convert to fraction form
    30,781.70/42,457.62 = 18,850.94/x
  3. Step 3: Cross multiply
    30,781.70x = 42,457.62 × 18,850.94
  4. Step 4: Simplify right side
    30,781.70x = 800,366,047.16
  5. Step 5: Solve for x
    x = 800,366,047.16/30,781.70
  6. Step 6: Final answer
    x = 26,001.36

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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.