Home / 20,689.86-28,551.68-11,258.40

Finding the Fourth Proportional to 20,689.86, 28,551.68 and 11,258.40

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Solution

The fourth proportional to 20,689.86, 28,551.68 and 11,258.40 is: 15,536.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.86 : 28,551.68 = 11,258.40 : x
  2. Step 2: Convert to fraction form
    20,689.86/28,551.68 = 11,258.40/x
  3. Step 3: Cross multiply
    20,689.86x = 28,551.68 × 11,258.40
  4. Step 4: Simplify right side
    20,689.86x = 321,446,234.11
  5. Step 5: Solve for x
    x = 321,446,234.11/20,689.86
  6. Step 6: Final answer
    x = 15,536.41

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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.