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Finding the Fourth Proportional to 78,697.20, 118,045.80 and 72,735.60

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Solution

The fourth proportional to 78,697.20, 118,045.80 and 72,735.60 is: 109,103.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,697.20 : 118,045.80 = 72,735.60 : x
  2. Step 2: Convert to fraction form
    78,697.20/118,045.80 = 72,735.60/x
  3. Step 3: Cross multiply
    78,697.20x = 118,045.80 × 72,735.60
  4. Step 4: Simplify right side
    78,697.20x = 8,586,132,090.48
  5. Step 5: Solve for x
    x = 8,586,132,090.48/78,697.20
  6. Step 6: Final answer
    x = 109,103.40

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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.