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Finding the Fourth Proportional to 7,179.69, 9,912.81 and 6,421.12

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Solution

The fourth proportional to 7,179.69, 9,912.81 and 6,421.12 is: 8,865.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,179.69 : 9,912.81 = 6,421.12 : x
  2. Step 2: Convert to fraction form
    7,179.69/9,912.81 = 6,421.12/x
  3. Step 3: Cross multiply
    7,179.69x = 9,912.81 × 6,421.12
  4. Step 4: Simplify right side
    7,179.69x = 63,651,341.84
  5. Step 5: Solve for x
    x = 63,651,341.84/7,179.69
  6. Step 6: Final answer
    x = 8,865.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.