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Finding the Fourth Proportional to 128,379, 177,103.30 and 83,071.60

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Solution

The fourth proportional to 128,379, 177,103.30 and 83,071.60 is: 114,600.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379 : 177,103.30 = 83,071.60 : x
  2. Step 2: Convert to fraction form
    128,379/177,103.30 = 83,071.60/x
  3. Step 3: Cross multiply
    128,379x = 177,103.30 × 83,071.60
  4. Step 4: Simplify right side
    128,379x = 14,712,254,496.28
  5. Step 5: Solve for x
    x = 14,712,254,496.28/128,379
  6. Step 6: Final answer
    x = 114,600.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.