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Finding the Fourth Proportional to 128,868.60, 193,302.90 and 69,819.60

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Solution

The fourth proportional to 128,868.60, 193,302.90 and 69,819.60 is: 104,729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,868.60 : 193,302.90 = 69,819.60 : x
  2. Step 2: Convert to fraction form
    128,868.60/193,302.90 = 69,819.60/x
  3. Step 3: Cross multiply
    128,868.60x = 193,302.90 × 69,819.60
  4. Step 4: Simplify right side
    128,868.60x = 13,496,331,156.84
  5. Step 5: Solve for x
    x = 13,496,331,156.84/128,868.60
  6. Step 6: Final answer
    x = 104,729.40

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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.