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Finding the Fourth Proportional to 115,128, 172,684.08 and 70,761.60

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Solution

The fourth proportional to 115,128, 172,684.08 and 70,761.60 is: 106,137.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,128 : 172,684.08 = 70,761.60 : x
  2. Step 2: Convert to fraction form
    115,128/172,684.08 = 70,761.60/x
  3. Step 3: Cross multiply
    115,128x = 172,684.08 × 70,761.60
  4. Step 4: Simplify right side
    115,128x = 12,219,401,795.33
  5. Step 5: Solve for x
    x = 12,219,401,795.33/115,128
  6. Step 6: Final answer
    x = 106,137.53

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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.