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Finding the Fourth Proportional to 170,428.40, 255,719.40 and 81,647.60

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Solution

The fourth proportional to 170,428.40, 255,719.40 and 81,647.60 is: 122,508.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,428.40 : 255,719.40 = 81,647.60 : x
  2. Step 2: Convert to fraction form
    170,428.40/255,719.40 = 81,647.60/x
  3. Step 3: Cross multiply
    170,428.40x = 255,719.40 × 81,647.60
  4. Step 4: Simplify right side
    170,428.40x = 20,878,875,283.44
  5. Step 5: Solve for x
    x = 20,878,875,283.44/170,428.40
  6. Step 6: Final answer
    x = 122,508.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.