Home / 428,085.44-642,135.36-161,971.28

Finding the Fourth Proportional to 428,085.44, 642,135.36 and 161,971.28

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Solution

The fourth proportional to 428,085.44, 642,135.36 and 161,971.28 is: 242,959.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,085.44 : 642,135.36 = 161,971.28 : x
  2. Step 2: Convert to fraction form
    428,085.44/642,135.36 = 161,971.28/x
  3. Step 3: Cross multiply
    428,085.44x = 642,135.36 × 161,971.28
  4. Step 4: Simplify right side
    428,085.44x = 104,007,486,192.46
  5. Step 5: Solve for x
    x = 104,007,486,192.46/428,085.44
  6. Step 6: Final answer
    x = 242,959.64

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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.