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Finding the Fourth Proportional to 1,226.77, 1,840.20 and 405.10

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Solution

The fourth proportional to 1,226.77, 1,840.20 and 405.10 is: 607.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.77 : 1,840.20 = 405.10 : x
  2. Step 2: Convert to fraction form
    1,226.77/1,840.20 = 405.10/x
  3. Step 3: Cross multiply
    1,226.77x = 1,840.20 × 405.10
  4. Step 4: Simplify right side
    1,226.77x = 745,465.02
  5. Step 5: Solve for x
    x = 745,465.02/1,226.77
  6. Step 6: Final answer
    x = 607.66

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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.