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Finding the Fourth Proportional to 28,676.80, 39,628.74 and 21,590.92

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Solution

The fourth proportional to 28,676.80, 39,628.74 and 21,590.92 is: 29,836.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,676.80 : 39,628.74 = 21,590.92 : x
  2. Step 2: Convert to fraction form
    28,676.80/39,628.74 = 21,590.92/x
  3. Step 3: Cross multiply
    28,676.80x = 39,628.74 × 21,590.92
  4. Step 4: Simplify right side
    28,676.80x = 855,620,955.04
  5. Step 5: Solve for x
    x = 855,620,955.04/28,676.80
  6. Step 6: Final answer
    x = 29,836.70

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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.