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Finding the Fourth Proportional to 79,138, 118,705.65 and 19,973.24

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Solution

The fourth proportional to 79,138, 118,705.65 and 19,973.24 is: 29,959.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,138 : 118,705.65 = 19,973.24 : x
  2. Step 2: Convert to fraction form
    79,138/118,705.65 = 19,973.24/x
  3. Step 3: Cross multiply
    79,138x = 118,705.65 × 19,973.24
  4. Step 4: Simplify right side
    79,138x = 2,370,936,436.81
  5. Step 5: Solve for x
    x = 2,370,936,436.81/79,138
  6. Step 6: Final answer
    x = 29,959.52

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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.