Home / 428,680.16-643,032.24-162,390.56

Finding the Fourth Proportional to 428,680.16, 643,032.24 and 162,390.56

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Solution

The fourth proportional to 428,680.16, 643,032.24 and 162,390.56 is: 243,590.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,680.16 : 643,032.24 = 162,390.56 : x
  2. Step 2: Convert to fraction form
    428,680.16/643,032.24 = 162,390.56/x
  3. Step 3: Cross multiply
    428,680.16x = 643,032.24 × 162,390.56
  4. Step 4: Simplify right side
    428,680.16x = 104,422,365,551.65
  5. Step 5: Solve for x
    x = 104,422,365,551.65/428,680.16
  6. Step 6: Final answer
    x = 243,590.39

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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.