Home / 7,980.72-11,015.64-5,187.12

Finding the Fourth Proportional to 7,980.72, 11,015.64 and 5,187.12

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Solution

The fourth proportional to 7,980.72, 11,015.64 and 5,187.12 is: 7,159.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.72 : 11,015.64 = 5,187.12 : x
  2. Step 2: Convert to fraction form
    7,980.72/11,015.64 = 5,187.12/x
  3. Step 3: Cross multiply
    7,980.72x = 11,015.64 × 5,187.12
  4. Step 4: Simplify right side
    7,980.72x = 57,139,446.56
  5. Step 5: Solve for x
    x = 57,139,446.56/7,980.72
  6. Step 6: Final answer
    x = 7,159.69

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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.