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Finding the Fourth Proportional to 78,154.92, 117,231.84 and 18,990.72

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Solution

The fourth proportional to 78,154.92, 117,231.84 and 18,990.72 is: 28,485.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,154.92 : 117,231.84 = 18,990.72 : x
  2. Step 2: Convert to fraction form
    78,154.92/117,231.84 = 18,990.72/x
  3. Step 3: Cross multiply
    78,154.92x = 117,231.84 × 18,990.72
  4. Step 4: Simplify right side
    78,154.92x = 2,226,317,048.52
  5. Step 5: Solve for x
    x = 2,226,317,048.52/78,154.92
  6. Step 6: Final answer
    x = 28,485.95

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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.