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Finding the Fourth Proportional to 818.48, 1,226.80 and 407.90

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Solution

The fourth proportional to 818.48, 1,226.80 and 407.90 is: 611.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.48 : 1,226.80 = 407.90 : x
  2. Step 2: Convert to fraction form
    818.48/1,226.80 = 407.90/x
  3. Step 3: Cross multiply
    818.48x = 1,226.80 × 407.90
  4. Step 4: Simplify right side
    818.48x = 500,411.72
  5. Step 5: Solve for x
    x = 500,411.72/818.48
  6. Step 6: Final answer
    x = 611.39

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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.