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Finding the Fourth Proportional to 26,821.80, 40,243.64 and 21,605.80

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Solution

The fourth proportional to 26,821.80, 40,243.64 and 21,605.80 is: 32,417.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,821.80 : 40,243.64 = 21,605.80 : x
  2. Step 2: Convert to fraction form
    26,821.80/40,243.64 = 21,605.80/x
  3. Step 3: Cross multiply
    26,821.80x = 40,243.64 × 21,605.80
  4. Step 4: Simplify right side
    26,821.80x = 869,496,037.11
  5. Step 5: Solve for x
    x = 869,496,037.11/26,821.80
  6. Step 6: Final answer
    x = 32,417.51

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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.