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Finding the Fourth Proportional to 78,714.80, 118,072.20 and 43,285.40

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Solution

The fourth proportional to 78,714.80, 118,072.20 and 43,285.40 is: 64,928.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,714.80 : 118,072.20 = 43,285.40 : x
  2. Step 2: Convert to fraction form
    78,714.80/118,072.20 = 43,285.40/x
  3. Step 3: Cross multiply
    78,714.80x = 118,072.20 × 43,285.40
  4. Step 4: Simplify right side
    78,714.80x = 5,110,802,405.88
  5. Step 5: Solve for x
    x = 5,110,802,405.88/78,714.80
  6. Step 6: Final answer
    x = 64,928.10

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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.