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Finding the Fourth Proportional to 818.24, 1,226.61 and 407.50

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Solution

The fourth proportional to 818.24, 1,226.61 and 407.50 is: 610.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.24 : 1,226.61 = 407.50 : x
  2. Step 2: Convert to fraction form
    818.24/1,226.61 = 407.50/x
  3. Step 3: Cross multiply
    818.24x = 1,226.61 × 407.50
  4. Step 4: Simplify right side
    818.24x = 499,840.51
  5. Step 5: Solve for x
    x = 499,840.51/818.24
  6. Step 6: Final answer
    x = 610.88

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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.