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Finding the Fourth Proportional to 9,339.72, 12,888.80 and 5,147.98

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Solution

The fourth proportional to 9,339.72, 12,888.80 and 5,147.98 is: 7,104.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,339.72 : 12,888.80 = 5,147.98 : x
  2. Step 2: Convert to fraction form
    9,339.72/12,888.80 = 5,147.98/x
  3. Step 3: Cross multiply
    9,339.72x = 12,888.80 × 5,147.98
  4. Step 4: Simplify right side
    9,339.72x = 66,351,284.62
  5. Step 5: Solve for x
    x = 66,351,284.62/9,339.72
  6. Step 6: Final answer
    x = 7,104.20

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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.