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Finding the Fourth Proportional to 78,855.97, 118,254.74 and 28,247.11

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Solution

The fourth proportional to 78,855.97, 118,254.74 and 28,247.11 is: 42,360.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,855.97 : 118,254.74 = 28,247.11 : x
  2. Step 2: Convert to fraction form
    78,855.97/118,254.74 = 28,247.11/x
  3. Step 3: Cross multiply
    78,855.97x = 118,254.74 × 28,247.11
  4. Step 4: Simplify right side
    78,855.97x = 3,340,354,623.97
  5. Step 5: Solve for x
    x = 3,340,354,623.97/78,855.97
  6. Step 6: Final answer
    x = 42,360.20

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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.