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Finding the Fourth Proportional to 78,119.30, 117,178.77 and 18,954.92

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Solution

The fourth proportional to 78,119.30, 117,178.77 and 18,954.92 is: 28,432.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,119.30 : 117,178.77 = 18,954.92 : x
  2. Step 2: Convert to fraction form
    78,119.30/117,178.77 = 18,954.92/x
  3. Step 3: Cross multiply
    78,119.30x = 117,178.77 × 18,954.92
  4. Step 4: Simplify right side
    78,119.30x = 2,221,114,211.05
  5. Step 5: Solve for x
    x = 2,221,114,211.05/78,119.30
  6. Step 6: Final answer
    x = 28,432.34

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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.