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Finding the Fourth Proportional to 128,746.34, 193,172.84 and 69,512.39

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Solution

The fourth proportional to 128,746.34, 193,172.84 and 69,512.39 is: 104,297.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,746.34 : 193,172.84 = 69,512.39 : x
  2. Step 2: Convert to fraction form
    128,746.34/193,172.84 = 69,512.39/x
  3. Step 3: Cross multiply
    128,746.34x = 193,172.84 × 69,512.39
  4. Step 4: Simplify right side
    128,746.34x = 13,427,905,443.93
  5. Step 5: Solve for x
    x = 13,427,905,443.93/128,746.34
  6. Step 6: Final answer
    x = 104,297.38

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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.