Home / 20,931.36-31,399.62-6,887.78

Finding the Fourth Proportional to 20,931.36, 31,399.62 and 6,887.78

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Solution

The fourth proportional to 20,931.36, 31,399.62 and 6,887.78 is: 10,332.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.36 : 31,399.62 = 6,887.78 : x
  2. Step 2: Convert to fraction form
    20,931.36/31,399.62 = 6,887.78/x
  3. Step 3: Cross multiply
    20,931.36x = 31,399.62 × 6,887.78
  4. Step 4: Simplify right side
    20,931.36x = 216,273,674.64
  5. Step 5: Solve for x
    x = 216,273,674.64/20,931.36
  6. Step 6: Final answer
    x = 10,332.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.