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Finding the Fourth Proportional to 20,689.92, 28,592.64 and 18,385.92

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Solution

The fourth proportional to 20,689.92, 28,592.64 and 18,385.92 is: 25,408.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.92 : 28,592.64 = 18,385.92 : x
  2. Step 2: Convert to fraction form
    20,689.92/28,592.64 = 18,385.92/x
  3. Step 3: Cross multiply
    20,689.92x = 28,592.64 × 18,385.92
  4. Step 4: Simplify right side
    20,689.92x = 525,701,991.63
  5. Step 5: Solve for x
    x = 525,701,991.63/20,689.92
  6. Step 6: Final answer
    x = 25,408.60

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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.