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Finding the Fourth Proportional to 74,859.20, 112,029.60 and 68,638.40

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Solution

The fourth proportional to 74,859.20, 112,029.60 and 68,638.40 is: 102,719.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,859.20 : 112,029.60 = 68,638.40 : x
  2. Step 2: Convert to fraction form
    74,859.20/112,029.60 = 68,638.40/x
  3. Step 3: Cross multiply
    74,859.20x = 112,029.60 × 68,638.40
  4. Step 4: Simplify right side
    74,859.20x = 7,689,532,496.64
  5. Step 5: Solve for x
    x = 7,689,532,496.64/74,859.20
  6. Step 6: Final answer
    x = 102,719.94

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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.