Home / 78,638.23-117,988.53-28,721.58

Finding the Fourth Proportional to 78,638.23, 117,988.53 and 28,721.58

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Solution

The fourth proportional to 78,638.23, 117,988.53 and 28,721.58 is: 43,093.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,638.23 : 117,988.53 = 28,721.58 : x
  2. Step 2: Convert to fraction form
    78,638.23/117,988.53 = 28,721.58/x
  3. Step 3: Cross multiply
    78,638.23x = 117,988.53 × 28,721.58
  4. Step 4: Simplify right side
    78,638.23x = 3,388,817,003.48
  5. Step 5: Solve for x
    x = 3,388,817,003.48/78,638.23
  6. Step 6: Final answer
    x = 43,093.76

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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.