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Finding the Fourth Proportional to 77,693.60, 116,540.40 and 68,938.40

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Solution

The fourth proportional to 77,693.60, 116,540.40 and 68,938.40 is: 103,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,693.60 : 116,540.40 = 68,938.40 : x
  2. Step 2: Convert to fraction form
    77,693.60/116,540.40 = 68,938.40/x
  3. Step 3: Cross multiply
    77,693.60x = 116,540.40 × 68,938.40
  4. Step 4: Simplify right side
    77,693.60x = 8,034,108,711.36
  5. Step 5: Solve for x
    x = 8,034,108,711.36/77,693.60
  6. Step 6: Final answer
    x = 103,407.60

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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.