Home / 20,830.78-28,746.53-11,399.95

Finding the Fourth Proportional to 20,830.78, 28,746.53 and 11,399.95

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Solution

The fourth proportional to 20,830.78, 28,746.53 and 11,399.95 is: 15,731.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.78 : 28,746.53 = 11,399.95 : x
  2. Step 2: Convert to fraction form
    20,830.78/28,746.53 = 11,399.95/x
  3. Step 3: Cross multiply
    20,830.78x = 28,746.53 × 11,399.95
  4. Step 4: Simplify right side
    20,830.78x = 327,709,004.67
  5. Step 5: Solve for x
    x = 327,709,004.67/20,830.78
  6. Step 6: Final answer
    x = 15,731.96

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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.