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Finding the Fourth Proportional to 78,992.80, 118,258.80 and 76,688.80

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Solution

The fourth proportional to 78,992.80, 118,258.80 and 76,688.80 is: 114,809.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,992.80 : 118,258.80 = 76,688.80 : x
  2. Step 2: Convert to fraction form
    78,992.80/118,258.80 = 76,688.80/x
  3. Step 3: Cross multiply
    78,992.80x = 118,258.80 × 76,688.80
  4. Step 4: Simplify right side
    78,992.80x = 9,069,125,461.44
  5. Step 5: Solve for x
    x = 9,069,125,461.44/78,992.80
  6. Step 6: Final answer
    x = 114,809.52

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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.