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Finding the Fourth Proportional to 78,729.95, 118,094.92 and 28,815.09

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Solution

The fourth proportional to 78,729.95, 118,094.92 and 28,815.09 is: 43,222.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,729.95 : 118,094.92 = 28,815.09 : x
  2. Step 2: Convert to fraction form
    78,729.95/118,094.92 = 28,815.09/x
  3. Step 3: Cross multiply
    78,729.95x = 118,094.92 × 28,815.09
  4. Step 4: Simplify right side
    78,729.95x = 3,402,916,100.34
  5. Step 5: Solve for x
    x = 3,402,916,100.34/78,729.95
  6. Step 6: Final answer
    x = 43,222.64

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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.