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Finding the Fourth Proportional to 8,969.42, 12,379.11 and 5,384.63

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Solution

The fourth proportional to 8,969.42, 12,379.11 and 5,384.63 is: 7,431.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,969.42 : 12,379.11 = 5,384.63 : x
  2. Step 2: Convert to fraction form
    8,969.42/12,379.11 = 5,384.63/x
  3. Step 3: Cross multiply
    8,969.42x = 12,379.11 × 5,384.63
  4. Step 4: Simplify right side
    8,969.42x = 66,656,927.08
  5. Step 5: Solve for x
    x = 66,656,927.08/8,969.42
  6. Step 6: Final answer
    x = 7,431.58

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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.