Home / 21,313.41-31,931.93-12,989.04

Finding the Fourth Proportional to 21,313.41, 31,931.93 and 12,989.04

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Solution

The fourth proportional to 21,313.41, 31,931.93 and 12,989.04 is: 19,460.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,313.41 : 31,931.93 = 12,989.04 : x
  2. Step 2: Convert to fraction form
    21,313.41/31,931.93 = 12,989.04/x
  3. Step 3: Cross multiply
    21,313.41x = 31,931.93 × 12,989.04
  4. Step 4: Simplify right side
    21,313.41x = 414,765,116.05
  5. Step 5: Solve for x
    x = 414,765,116.05/21,313.41
  6. Step 6: Final answer
    x = 19,460.29

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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.