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Finding the Fourth Proportional to 9,339.69, 12,888.78 and 5,147.94

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Solution

The fourth proportional to 9,339.69, 12,888.78 and 5,147.94 is: 7,104.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,339.69 : 12,888.78 = 5,147.94 : x
  2. Step 2: Convert to fraction form
    9,339.69/12,888.78 = 5,147.94/x
  3. Step 3: Cross multiply
    9,339.69x = 12,888.78 × 5,147.94
  4. Step 4: Simplify right side
    9,339.69x = 66,350,666.11
  5. Step 5: Solve for x
    x = 66,350,666.11/9,339.69
  6. Step 6: Final answer
    x = 7,104.16

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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.