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Finding the Fourth Proportional to 20,663, 31,106.95 and 18,825.92

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Solution

The fourth proportional to 20,663, 31,106.95 and 18,825.92 is: 28,341.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,663 : 31,106.95 = 18,825.92 : x
  2. Step 2: Convert to fraction form
    20,663/31,106.95 = 18,825.92/x
  3. Step 3: Cross multiply
    20,663x = 31,106.95 × 18,825.92
  4. Step 4: Simplify right side
    20,663x = 585,616,952.14
  5. Step 5: Solve for x
    x = 585,616,952.14/20,663
  6. Step 6: Final answer
    x = 28,341.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.