Home / 428,101.47-642,147.55-128,569.28

Finding the Fourth Proportional to 428,101.47, 642,147.55 and 128,569.28

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Solution

The fourth proportional to 428,101.47, 642,147.55 and 128,569.28 is: 192,852.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,101.47 : 642,147.55 = 128,569.28 : x
  2. Step 2: Convert to fraction form
    428,101.47/642,147.55 = 128,569.28/x
  3. Step 3: Cross multiply
    428,101.47x = 642,147.55 × 128,569.28
  4. Step 4: Simplify right side
    428,101.47x = 82,560,444,625.10
  5. Step 5: Solve for x
    x = 82,560,444,625.10/428,101.47
  6. Step 6: Final answer
    x = 192,852.51

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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.