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Finding the Fourth Proportional to 8,431, 12,639.18 and 4,530.84

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Solution

The fourth proportional to 8,431, 12,639.18 and 4,530.84 is: 6,792.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,431 : 12,639.18 = 4,530.84 : x
  2. Step 2: Convert to fraction form
    8,431/12,639.18 = 4,530.84/x
  3. Step 3: Cross multiply
    8,431x = 12,639.18 × 4,530.84
  4. Step 4: Simplify right side
    8,431x = 57,266,102.31
  5. Step 5: Solve for x
    x = 57,266,102.31/8,431
  6. Step 6: Final answer
    x = 6,792.33

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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.