Home / 21,004.90-28,979.13-12,509.62

Finding the Fourth Proportional to 21,004.90, 28,979.13 and 12,509.62

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Solution

The fourth proportional to 21,004.90, 28,979.13 and 12,509.62 is: 17,258.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,004.90 : 28,979.13 = 12,509.62 : x
  2. Step 2: Convert to fraction form
    21,004.90/28,979.13 = 12,509.62/x
  3. Step 3: Cross multiply
    21,004.90x = 28,979.13 × 12,509.62
  4. Step 4: Simplify right side
    21,004.90x = 362,517,904.23
  5. Step 5: Solve for x
    x = 362,517,904.23/21,004.90
  6. Step 6: Final answer
    x = 17,258.73

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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.