Home / 428,030.56-642,045.03-128,510.65

Finding the Fourth Proportional to 428,030.56, 642,045.03 and 128,510.65

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Solution

The fourth proportional to 428,030.56, 642,045.03 and 128,510.65 is: 192,765.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,030.56 : 642,045.03 = 128,510.65 : x
  2. Step 2: Convert to fraction form
    428,030.56/642,045.03 = 128,510.65/x
  3. Step 3: Cross multiply
    428,030.56x = 642,045.03 × 128,510.65
  4. Step 4: Simplify right side
    428,030.56x = 82,509,624,134.57
  5. Step 5: Solve for x
    x = 82,509,624,134.57/428,030.56
  6. Step 6: Final answer
    x = 192,765.73

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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.