Home / 21,187.32-31,782.18-8,039.40

Finding the Fourth Proportional to 21,187.32, 31,782.18 and 8,039.40

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Solution

The fourth proportional to 21,187.32, 31,782.18 and 8,039.40 is: 12,059.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,187.32 : 31,782.18 = 8,039.40 : x
  2. Step 2: Convert to fraction form
    21,187.32/31,782.18 = 8,039.40/x
  3. Step 3: Cross multiply
    21,187.32x = 31,782.18 × 8,039.40
  4. Step 4: Simplify right side
    21,187.32x = 255,509,657.89
  5. Step 5: Solve for x
    x = 255,509,657.89/21,187.32
  6. Step 6: Final answer
    x = 12,059.56

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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.