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Finding the Fourth Proportional to 128,841.92, 178,992.32 and 127,688.48

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Solution

The fourth proportional to 128,841.92, 178,992.32 and 127,688.48 is: 177,389.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,841.92 : 178,992.32 = 127,688.48 : x
  2. Step 2: Convert to fraction form
    128,841.92/178,992.32 = 127,688.48/x
  3. Step 3: Cross multiply
    128,841.92x = 178,992.32 × 127,688.48
  4. Step 4: Simplify right side
    128,841.92x = 22,855,257,272.47
  5. Step 5: Solve for x
    x = 22,855,257,272.47/128,841.92
  6. Step 6: Final answer
    x = 177,389.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.