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Finding the Fourth Proportional to 20,789, 28,689.45 and 11,358.18

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Solution

The fourth proportional to 20,789, 28,689.45 and 11,358.18 is: 15,674.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789 : 28,689.45 = 11,358.18 : x
  2. Step 2: Convert to fraction form
    20,789/28,689.45 = 11,358.18/x
  3. Step 3: Cross multiply
    20,789x = 28,689.45 × 11,358.18
  4. Step 4: Simplify right side
    20,789x = 325,859,937.20
  5. Step 5: Solve for x
    x = 325,859,937.20/20,789
  6. Step 6: Final answer
    x = 15,674.63

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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.