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Finding the Fourth Proportional to 78,161.72, 117,242.62 and 18,996.98

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Solution

The fourth proportional to 78,161.72, 117,242.62 and 18,996.98 is: 28,495.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,161.72 : 117,242.62 = 18,996.98 : x
  2. Step 2: Convert to fraction form
    78,161.72/117,242.62 = 18,996.98/x
  3. Step 3: Cross multiply
    78,161.72x = 117,242.62 × 18,996.98
  4. Step 4: Simplify right side
    78,161.72x = 2,227,255,707.29
  5. Step 5: Solve for x
    x = 2,227,255,707.29/78,161.72
  6. Step 6: Final answer
    x = 28,495.48

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1.5x scale

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.