Home / 20,887.36-31,331.16-8,238.40

Finding the Fourth Proportional to 20,887.36, 31,331.16 and 8,238.40

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Solution

The fourth proportional to 20,887.36, 31,331.16 and 8,238.40 is: 12,357.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,887.36 : 31,331.16 = 8,238.40 : x
  2. Step 2: Convert to fraction form
    20,887.36/31,331.16 = 8,238.40/x
  3. Step 3: Cross multiply
    20,887.36x = 31,331.16 × 8,238.40
  4. Step 4: Simplify right side
    20,887.36x = 258,118,628.54
  5. Step 5: Solve for x
    x = 258,118,628.54/20,887.36
  6. Step 6: Final answer
    x = 12,357.65

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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.