Home / 21,439.84-31,969.64-20,009.92

Finding the Fourth Proportional to 21,439.84, 31,969.64 and 20,009.92

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Solution

The fourth proportional to 21,439.84, 31,969.64 and 20,009.92 is: 29,837.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,439.84 : 31,969.64 = 20,009.92 : x
  2. Step 2: Convert to fraction form
    21,439.84/31,969.64 = 20,009.92/x
  3. Step 3: Cross multiply
    21,439.84x = 31,969.64 × 20,009.92
  4. Step 4: Simplify right side
    21,439.84x = 639,709,938.83
  5. Step 5: Solve for x
    x = 639,709,938.83/21,439.84
  6. Step 6: Final answer
    x = 29,837.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.