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Finding the Fourth Proportional to 78,054.53, 117,081.80 and 18,890.21

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Solution

The fourth proportional to 78,054.53, 117,081.80 and 18,890.21 is: 28,335.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,054.53 : 117,081.80 = 18,890.21 : x
  2. Step 2: Convert to fraction form
    78,054.53/117,081.80 = 18,890.21/x
  3. Step 3: Cross multiply
    78,054.53x = 117,081.80 × 18,890.21
  4. Step 4: Simplify right side
    78,054.53x = 2,211,699,789.18
  5. Step 5: Solve for x
    x = 2,211,699,789.18/78,054.53
  6. Step 6: Final answer
    x = 28,335.32

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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.