Home / 428,438.20-642,657.30-162,207.40

Finding the Fourth Proportional to 428,438.20, 642,657.30 and 162,207.40

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Solution

The fourth proportional to 428,438.20, 642,657.30 and 162,207.40 is: 243,311.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,438.20 : 642,657.30 = 162,207.40 : x
  2. Step 2: Convert to fraction form
    428,438.20/642,657.30 = 162,207.40/x
  3. Step 3: Cross multiply
    428,438.20x = 642,657.30 × 162,207.40
  4. Step 4: Simplify right side
    428,438.20x = 104,243,769,724.02
  5. Step 5: Solve for x
    x = 104,243,769,724.02/428,438.20
  6. Step 6: Final answer
    x = 243,311.10

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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.