Home / 28,769.70-39,699.30-21,220.11

Finding the Fourth Proportional to 28,769.70, 39,699.30 and 21,220.11

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Solution

The fourth proportional to 28,769.70, 39,699.30 and 21,220.11 is: 29,281.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,769.70 : 39,699.30 = 21,220.11 : x
  2. Step 2: Convert to fraction form
    28,769.70/39,699.30 = 21,220.11/x
  3. Step 3: Cross multiply
    28,769.70x = 39,699.30 × 21,220.11
  4. Step 4: Simplify right side
    28,769.70x = 842,423,512.92
  5. Step 5: Solve for x
    x = 842,423,512.92/28,769.70
  6. Step 6: Final answer
    x = 29,281.62

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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.