Home / 20,999.79-29,007.32-15,685.38

Finding the Fourth Proportional to 20,999.79, 29,007.32 and 15,685.38

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Solution

The fourth proportional to 20,999.79, 29,007.32 and 15,685.38 is: 21,666.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.79 : 29,007.32 = 15,685.38 : x
  2. Step 2: Convert to fraction form
    20,999.79/29,007.32 = 15,685.38/x
  3. Step 3: Cross multiply
    20,999.79x = 29,007.32 × 15,685.38
  4. Step 4: Simplify right side
    20,999.79x = 454,990,758.55
  5. Step 5: Solve for x
    x = 454,990,758.55/20,999.79
  6. Step 6: Final answer
    x = 21,666.44

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1.5x scale

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.