Home / 21,320.12-31,976.40-12,544.76

Finding the Fourth Proportional to 21,320.12, 31,976.40 and 12,544.76

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Solution

The fourth proportional to 21,320.12, 31,976.40 and 12,544.76 is: 18,814.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.12 : 31,976.40 = 12,544.76 : x
  2. Step 2: Convert to fraction form
    21,320.12/31,976.40 = 12,544.76/x
  3. Step 3: Cross multiply
    21,320.12x = 31,976.40 × 12,544.76
  4. Step 4: Simplify right side
    21,320.12x = 401,136,263.66
  5. Step 5: Solve for x
    x = 401,136,263.66/21,320.12
  6. Step 6: Final answer
    x = 18,814.92

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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.