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Finding the Fourth Proportional to 20,359.88, 28,097.88 and 11,407.94

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Solution

The fourth proportional to 20,359.88, 28,097.88 and 11,407.94 is: 15,743.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,359.88 : 28,097.88 = 11,407.94 : x
  2. Step 2: Convert to fraction form
    20,359.88/28,097.88 = 11,407.94/x
  3. Step 3: Cross multiply
    20,359.88x = 28,097.88 × 11,407.94
  4. Step 4: Simplify right side
    20,359.88x = 320,538,929.17
  5. Step 5: Solve for x
    x = 320,538,929.17/20,359.88
  6. Step 6: Final answer
    x = 15,743.66

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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.