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Finding the Fourth Proportional to 78,830.40, 118,245.60 and 76,643.40

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Solution

The fourth proportional to 78,830.40, 118,245.60 and 76,643.40 is: 114,965.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,830.40 : 118,245.60 = 76,643.40 : x
  2. Step 2: Convert to fraction form
    78,830.40/118,245.60 = 76,643.40/x
  3. Step 3: Cross multiply
    78,830.40x = 118,245.60 × 76,643.40
  4. Step 4: Simplify right side
    78,830.40x = 9,062,744,819.04
  5. Step 5: Solve for x
    x = 9,062,744,819.04/78,830.40
  6. Step 6: Final answer
    x = 114,965.10

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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.