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Finding the Fourth Proportional to 428,479.67, 642,590.11 and 128,880.72

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Solution

The fourth proportional to 428,479.67, 642,590.11 and 128,880.72 is: 193,282.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,479.67 : 642,590.11 = 128,880.72 : x
  2. Step 2: Convert to fraction form
    428,479.67/642,590.11 = 128,880.72/x
  3. Step 3: Cross multiply
    428,479.67x = 642,590.11 × 128,880.72
  4. Step 4: Simplify right side
    428,479.67x = 82,817,476,202.78
  5. Step 5: Solve for x
    x = 82,817,476,202.78/428,479.67
  6. Step 6: Final answer
    x = 193,282.16

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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.