Home / 21,288.30-31,931.37-8,139.66

Finding the Fourth Proportional to 21,288.30, 31,931.37 and 8,139.66

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Solution

The fourth proportional to 21,288.30, 31,931.37 and 8,139.66 is: 12,209.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.30 : 31,931.37 = 8,139.66 : x
  2. Step 2: Convert to fraction form
    21,288.30/31,931.37 = 8,139.66/x
  3. Step 3: Cross multiply
    21,288.30x = 31,931.37 × 8,139.66
  4. Step 4: Simplify right side
    21,288.30x = 259,910,495.13
  5. Step 5: Solve for x
    x = 259,910,495.13/21,288.30
  6. Step 6: Final answer
    x = 12,209.08

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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.