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Finding the Fourth Proportional to 11,129.69, 15,369.37 and 7,157.69

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Solution

The fourth proportional to 11,129.69, 15,369.37 and 7,157.69 is: 9,884.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,129.69 : 15,369.37 = 7,157.69 : x
  2. Step 2: Convert to fraction form
    11,129.69/15,369.37 = 7,157.69/x
  3. Step 3: Cross multiply
    11,129.69x = 15,369.37 × 7,157.69
  4. Step 4: Simplify right side
    11,129.69x = 110,009,206.48
  5. Step 5: Solve for x
    x = 110,009,206.48/11,129.69
  6. Step 6: Final answer
    x = 9,884.31

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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.