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Finding the Fourth Proportional to 78,990.28, 118,492.84 and 29,071.32

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Solution

The fourth proportional to 78,990.28, 118,492.84 and 29,071.32 is: 43,609.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,990.28 : 118,492.84 = 29,071.32 : x
  2. Step 2: Convert to fraction form
    78,990.28/118,492.84 = 29,071.32/x
  3. Step 3: Cross multiply
    78,990.28x = 118,492.84 × 29,071.32
  4. Step 4: Simplify right side
    78,990.28x = 3,444,743,269.35
  5. Step 5: Solve for x
    x = 3,444,743,269.35/78,990.28
  6. Step 6: Final answer
    x = 43,609.71

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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.