Home / 21,023.40-31,499.42-12,685.90

Finding the Fourth Proportional to 21,023.40, 31,499.42 and 12,685.90

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Solution

The fourth proportional to 21,023.40, 31,499.42 and 12,685.90 is: 19,007.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,023.40 : 31,499.42 = 12,685.90 : x
  2. Step 2: Convert to fraction form
    21,023.40/31,499.42 = 12,685.90/x
  3. Step 3: Cross multiply
    21,023.40x = 31,499.42 × 12,685.90
  4. Step 4: Simplify right side
    21,023.40x = 399,598,350.00
  5. Step 5: Solve for x
    x = 399,598,350.00/21,023.40
  6. Step 6: Final answer
    x = 19,007.31

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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.