Home / 20,939.78-28,898.50-11,990.08

Finding the Fourth Proportional to 20,939.78, 28,898.50 and 11,990.08

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Solution

The fourth proportional to 20,939.78, 28,898.50 and 11,990.08 is: 16,547.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.78 : 28,898.50 = 11,990.08 : x
  2. Step 2: Convert to fraction form
    20,939.78/28,898.50 = 11,990.08/x
  3. Step 3: Cross multiply
    20,939.78x = 28,898.50 × 11,990.08
  4. Step 4: Simplify right side
    20,939.78x = 346,495,326.88
  5. Step 5: Solve for x
    x = 346,495,326.88/20,939.78
  6. Step 6: Final answer
    x = 16,547.23

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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.