Home / 428,311.65-642,500.28-112,764

Finding the Fourth Proportional to 428,311.65, 642,500.28 and 112,764

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Solution

The fourth proportional to 428,311.65, 642,500.28 and 112,764 is: 169,154.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,311.65 : 642,500.28 = 112,764 : x
  2. Step 2: Convert to fraction form
    428,311.65/642,500.28 = 112,764/x
  3. Step 3: Cross multiply
    428,311.65x = 642,500.28 × 112,764
  4. Step 4: Simplify right side
    428,311.65x = 72,450,901,573.92
  5. Step 5: Solve for x
    x = 72,450,901,573.92/428,311.65
  6. Step 6: Final answer
    x = 169,154.64

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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.