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Finding the Fourth Proportional to 78,701.70, 118,052.55 and 28,765.20

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Solution

The fourth proportional to 78,701.70, 118,052.55 and 28,765.20 is: 43,147.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.70 : 118,052.55 = 28,765.20 : x
  2. Step 2: Convert to fraction form
    78,701.70/118,052.55 = 28,765.20/x
  3. Step 3: Cross multiply
    78,701.70x = 118,052.55 × 28,765.20
  4. Step 4: Simplify right side
    78,701.70x = 3,395,805,211.26
  5. Step 5: Solve for x
    x = 3,395,805,211.26/78,701.70
  6. Step 6: Final answer
    x = 43,147.80

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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.