Home / 21,705.84-29,921.40-16,981.92

Finding the Fourth Proportional to 21,705.84, 29,921.40 and 16,981.92

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Solution

The fourth proportional to 21,705.84, 29,921.40 and 16,981.92 is: 23,409.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,705.84 : 29,921.40 = 16,981.92 : x
  2. Step 2: Convert to fraction form
    21,705.84/29,921.40 = 16,981.92/x
  3. Step 3: Cross multiply
    21,705.84x = 29,921.40 × 16,981.92
  4. Step 4: Simplify right side
    21,705.84x = 508,122,821.09
  5. Step 5: Solve for x
    x = 508,122,821.09/21,705.84
  6. Step 6: Final answer
    x = 23,409.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.