Home / 8,921.37-12,311.75-5,145.71

Finding the Fourth Proportional to 8,921.37, 12,311.75 and 5,145.71

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Solution

The fourth proportional to 8,921.37, 12,311.75 and 5,145.71 is: 7,101.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,921.37 : 12,311.75 = 5,145.71 : x
  2. Step 2: Convert to fraction form
    8,921.37/12,311.75 = 5,145.71/x
  3. Step 3: Cross multiply
    8,921.37x = 12,311.75 × 5,145.71
  4. Step 4: Simplify right side
    8,921.37x = 63,352,607.81
  5. Step 5: Solve for x
    x = 63,352,607.81/8,921.37
  6. Step 6: Final answer
    x = 7,101.22

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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.