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Finding the Fourth Proportional to 28,821.70, 43,123.20 and 18,980.20

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Solution

The fourth proportional to 28,821.70, 43,123.20 and 18,980.20 is: 28,398.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,821.70 : 43,123.20 = 18,980.20 : x
  2. Step 2: Convert to fraction form
    28,821.70/43,123.20 = 18,980.20/x
  3. Step 3: Cross multiply
    28,821.70x = 43,123.20 × 18,980.20
  4. Step 4: Simplify right side
    28,821.70x = 818,486,960.64
  5. Step 5: Solve for x
    x = 818,486,960.64/28,821.70
  6. Step 6: Final answer
    x = 28,398.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.