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Finding the Fourth Proportional to 10,879.76, 15,009.64 and 7,101.64

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Solution

The fourth proportional to 10,879.76, 15,009.64 and 7,101.64 is: 9,797.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,879.76 : 15,009.64 = 7,101.64 : x
  2. Step 2: Convert to fraction form
    10,879.76/15,009.64 = 7,101.64/x
  3. Step 3: Cross multiply
    10,879.76x = 15,009.64 × 7,101.64
  4. Step 4: Simplify right side
    10,879.76x = 106,593,059.81
  5. Step 5: Solve for x
    x = 106,593,059.81/10,879.76
  6. Step 6: Final answer
    x = 9,797.37

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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.