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Finding the Fourth Proportional to 78,425.40, 117,638.10 and 73,241.40

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Solution

The fourth proportional to 78,425.40, 117,638.10 and 73,241.40 is: 109,862.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,425.40 : 117,638.10 = 73,241.40 : x
  2. Step 2: Convert to fraction form
    78,425.40/117,638.10 = 73,241.40/x
  3. Step 3: Cross multiply
    78,425.40x = 117,638.10 × 73,241.40
  4. Step 4: Simplify right side
    78,425.40x = 8,615,979,137.34
  5. Step 5: Solve for x
    x = 8,615,979,137.34/78,425.40
  6. Step 6: Final answer
    x = 109,862.10

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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.