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Finding the Fourth Proportional to 428,879.30, 643,124.55 and 162,551.30

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Solution

The fourth proportional to 428,879.30, 643,124.55 and 162,551.30 is: 243,753.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,879.30 : 643,124.55 = 162,551.30 : x
  2. Step 2: Convert to fraction form
    428,879.30/643,124.55 = 162,551.30/x
  3. Step 3: Cross multiply
    428,879.30x = 643,124.55 × 162,551.30
  4. Step 4: Simplify right side
    428,879.30x = 104,540,731,664.42
  5. Step 5: Solve for x
    x = 104,540,731,664.42/428,879.30
  6. Step 6: Final answer
    x = 243,753.27

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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.