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Finding the Fourth Proportional to 20,690.92, 28,594.02 and 18,386.92

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Solution

The fourth proportional to 20,690.92, 28,594.02 and 18,386.92 is: 25,409.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.92 : 28,594.02 = 18,386.92 : x
  2. Step 2: Convert to fraction form
    20,690.92/28,594.02 = 18,386.92/x
  3. Step 3: Cross multiply
    20,690.92x = 28,594.02 × 18,386.92
  4. Step 4: Simplify right side
    20,690.92x = 525,755,958.22
  5. Step 5: Solve for x
    x = 525,755,958.22/20,690.92
  6. Step 6: Final answer
    x = 25,409.98

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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.