Home / 21,115.08-31,686.60-11,261.46

Finding the Fourth Proportional to 21,115.08, 31,686.60 and 11,261.46

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Solution

The fourth proportional to 21,115.08, 31,686.60 and 11,261.46 is: 16,899.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.08 : 31,686.60 = 11,261.46 : x
  2. Step 2: Convert to fraction form
    21,115.08/31,686.60 = 11,261.46/x
  3. Step 3: Cross multiply
    21,115.08x = 31,686.60 × 11,261.46
  4. Step 4: Simplify right side
    21,115.08x = 356,837,378.44
  5. Step 5: Solve for x
    x = 356,837,378.44/21,115.08
  6. Step 6: Final answer
    x = 16,899.65

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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.