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Finding the Fourth Proportional to 128,511.81, 177,325.14 and 80,731.32

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Solution

The fourth proportional to 128,511.81, 177,325.14 and 80,731.32 is: 111,395.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,511.81 : 177,325.14 = 80,731.32 : x
  2. Step 2: Convert to fraction form
    128,511.81/177,325.14 = 80,731.32/x
  3. Step 3: Cross multiply
    128,511.81x = 177,325.14 × 80,731.32
  4. Step 4: Simplify right side
    128,511.81x = 14,315,692,621.38
  5. Step 5: Solve for x
    x = 14,315,692,621.38/128,511.81
  6. Step 6: Final answer
    x = 111,395.93

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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.