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Finding the Fourth Proportional to 128,840.56, 177,710 and 124,505.44

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Solution

The fourth proportional to 128,840.56, 177,710 and 124,505.44 is: 171,730.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,840.56 : 177,710 = 124,505.44 : x
  2. Step 2: Convert to fraction form
    128,840.56/177,710 = 124,505.44/x
  3. Step 3: Cross multiply
    128,840.56x = 177,710 × 124,505.44
  4. Step 4: Simplify right side
    128,840.56x = 22,125,861,742.40
  5. Step 5: Solve for x
    x = 22,125,861,742.40/128,840.56
  6. Step 6: Final answer
    x = 171,730.56

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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.