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Finding the Fourth Proportional to 13,329.66, 18,390.87 and 7,739.58

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Solution

The fourth proportional to 13,329.66, 18,390.87 and 7,739.58 is: 10,678.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,329.66 : 18,390.87 = 7,739.58 : x
  2. Step 2: Convert to fraction form
    13,329.66/18,390.87 = 7,739.58/x
  3. Step 3: Cross multiply
    13,329.66x = 18,390.87 × 7,739.58
  4. Step 4: Simplify right side
    13,329.66x = 142,337,609.63
  5. Step 5: Solve for x
    x = 142,337,609.63/13,329.66
  6. Step 6: Final answer
    x = 10,678.26

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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.