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Finding the Fourth Proportional to 78,992.61, 118,488.88 and 31,629.03

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Solution

The fourth proportional to 78,992.61, 118,488.88 and 31,629.03 is: 47,443.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,992.61 : 118,488.88 = 31,629.03 : x
  2. Step 2: Convert to fraction form
    78,992.61/118,488.88 = 31,629.03/x
  3. Step 3: Cross multiply
    78,992.61x = 118,488.88 × 31,629.03
  4. Step 4: Simplify right side
    78,992.61x = 3,747,688,340.19
  5. Step 5: Solve for x
    x = 3,747,688,340.19/78,992.61
  6. Step 6: Final answer
    x = 47,443.53

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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.