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Finding the Fourth Proportional to 128,518.92, 177,458.10 and 85,539.72

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Solution

The fourth proportional to 128,518.92, 177,458.10 and 85,539.72 is: 118,112.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.92 : 177,458.10 = 85,539.72 : x
  2. Step 2: Convert to fraction form
    128,518.92/177,458.10 = 85,539.72/x
  3. Step 3: Cross multiply
    128,518.92x = 177,458.10 × 85,539.72
  4. Step 4: Simplify right side
    128,518.92x = 15,179,716,185.73
  5. Step 5: Solve for x
    x = 15,179,716,185.73/128,518.92
  6. Step 6: Final answer
    x = 118,112.70

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1.5x scale

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.