Home / 428,253.77-642,439.63-143,966.39

Finding the Fourth Proportional to 428,253.77, 642,439.63 and 143,966.39

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Solution

The fourth proportional to 428,253.77, 642,439.63 and 143,966.39 is: 215,969.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,253.77 : 642,439.63 = 143,966.39 : x
  2. Step 2: Convert to fraction form
    428,253.77/642,439.63 = 143,966.39/x
  3. Step 3: Cross multiply
    428,253.77x = 642,439.63 × 143,966.39
  4. Step 4: Simplify right side
    428,253.77x = 92,489,711,291.80
  5. Step 5: Solve for x
    x = 92,489,711,291.80/428,253.77
  6. Step 6: Final answer
    x = 215,969.40

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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.