Home / 428,911.21-642,917.88-144,503.48

Finding the Fourth Proportional to 428,911.21, 642,917.88 and 144,503.48

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Solution

The fourth proportional to 428,911.21, 642,917.88 and 144,503.48 is: 216,603.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,911.21 : 642,917.88 = 144,503.48 : x
  2. Step 2: Convert to fraction form
    428,911.21/642,917.88 = 144,503.48/x
  3. Step 3: Cross multiply
    428,911.21x = 642,917.88 × 144,503.48
  4. Step 4: Simplify right side
    428,911.21x = 92,903,867,077.12
  5. Step 5: Solve for x
    x = 92,903,867,077.12/428,911.21
  6. Step 6: Final answer
    x = 216,603.96

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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.