Home / 11,420.48-15,755.40-7,168.64

Finding the Fourth Proportional to 11,420.48, 15,755.40 and 7,168.64

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Solution

The fourth proportional to 11,420.48, 15,755.40 and 7,168.64 is: 9,889.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,420.48 : 15,755.40 = 7,168.64 : x
  2. Step 2: Convert to fraction form
    11,420.48/15,755.40 = 7,168.64/x
  3. Step 3: Cross multiply
    11,420.48x = 15,755.40 × 7,168.64
  4. Step 4: Simplify right side
    11,420.48x = 112,944,790.66
  5. Step 5: Solve for x
    x = 112,944,790.66/11,420.48
  6. Step 6: Final answer
    x = 9,889.67

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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.