Home / 21,185.12-31,777.87-5,390.17

Finding the Fourth Proportional to 21,185.12, 31,777.87 and 5,390.17

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Solution

The fourth proportional to 21,185.12, 31,777.87 and 5,390.17 is: 8,085.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,185.12 : 31,777.87 = 5,390.17 : x
  2. Step 2: Convert to fraction form
    21,185.12/31,777.87 = 5,390.17/x
  3. Step 3: Cross multiply
    21,185.12x = 31,777.87 × 5,390.17
  4. Step 4: Simplify right side
    21,185.12x = 171,288,168.00
  5. Step 5: Solve for x
    x = 171,288,168.00/21,185.12
  6. Step 6: Final answer
    x = 8,085.30

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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.