Home / 428,329.80-642,446.10-112,811.40

Finding the Fourth Proportional to 428,329.80, 642,446.10 and 112,811.40

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Solution

The fourth proportional to 428,329.80, 642,446.10 and 112,811.40 is: 169,204.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,329.80 : 642,446.10 = 112,811.40 : x
  2. Step 2: Convert to fraction form
    428,329.80/642,446.10 = 112,811.40/x
  3. Step 3: Cross multiply
    428,329.80x = 642,446.10 × 112,811.40
  4. Step 4: Simplify right side
    428,329.80x = 72,475,243,965.54
  5. Step 5: Solve for x
    x = 72,475,243,965.54/428,329.80
  6. Step 6: Final answer
    x = 169,204.30

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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.