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Finding the Fourth Proportional to 1,332.21, 1,998.18 and 407.78

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Solution

The fourth proportional to 1,332.21, 1,998.18 and 407.78 is: 611.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.21 : 1,998.18 = 407.78 : x
  2. Step 2: Convert to fraction form
    1,332.21/1,998.18 = 407.78/x
  3. Step 3: Cross multiply
    1,332.21x = 1,998.18 × 407.78
  4. Step 4: Simplify right side
    1,332.21x = 814,807.85
  5. Step 5: Solve for x
    x = 814,807.85/1,332.21
  6. Step 6: Final answer
    x = 611.62

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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.