Home / 7,981.12-11,015.76-5,181.76

Finding the Fourth Proportional to 7,981.12, 11,015.76 and 5,181.76

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Solution

The fourth proportional to 7,981.12, 11,015.76 and 5,181.76 is: 7,152.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,981.12 : 11,015.76 = 5,181.76 : x
  2. Step 2: Convert to fraction form
    7,981.12/11,015.76 = 5,181.76/x
  3. Step 3: Cross multiply
    7,981.12x = 11,015.76 × 5,181.76
  4. Step 4: Simplify right side
    7,981.12x = 57,081,024.54
  5. Step 5: Solve for x
    x = 57,081,024.54/7,981.12
  6. Step 6: Final answer
    x = 7,152.01

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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.