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Finding the Fourth Proportional to 78,104.79, 117,132.96 and 28,178.40

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Solution

The fourth proportional to 78,104.79, 117,132.96 and 28,178.40 is: 42,258.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,104.79 : 117,132.96 = 28,178.40 : x
  2. Step 2: Convert to fraction form
    78,104.79/117,132.96 = 28,178.40/x
  3. Step 3: Cross multiply
    78,104.79x = 117,132.96 × 28,178.40
  4. Step 4: Simplify right side
    78,104.79x = 3,300,619,400.06
  5. Step 5: Solve for x
    x = 3,300,619,400.06/78,104.79
  6. Step 6: Final answer
    x = 42,258.86

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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.