Home / 21,074.76-31,621.36-9,989.36

Finding the Fourth Proportional to 21,074.76, 31,621.36 and 9,989.36

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Solution

The fourth proportional to 21,074.76, 31,621.36 and 9,989.36 is: 14,988.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,074.76 : 31,621.36 = 9,989.36 : x
  2. Step 2: Convert to fraction form
    21,074.76/31,621.36 = 9,989.36/x
  3. Step 3: Cross multiply
    21,074.76x = 31,621.36 × 9,989.36
  4. Step 4: Simplify right side
    21,074.76x = 315,877,148.73
  5. Step 5: Solve for x
    x = 315,877,148.73/21,074.76
  6. Step 6: Final answer
    x = 14,988.41

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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.