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Finding the Fourth Proportional to 78,638.46, 117,989.01 and 28,721.94

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Solution

The fourth proportional to 78,638.46, 117,989.01 and 28,721.94 is: 43,094.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,638.46 : 117,989.01 = 28,721.94 : x
  2. Step 2: Convert to fraction form
    78,638.46/117,989.01 = 28,721.94/x
  3. Step 3: Cross multiply
    78,638.46x = 117,989.01 × 28,721.94
  4. Step 4: Simplify right side
    78,638.46x = 3,388,873,265.88
  5. Step 5: Solve for x
    x = 3,388,873,265.88/78,638.46
  6. Step 6: Final answer
    x = 43,094.35

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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.