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Finding the Fourth Proportional to 1,101.18, 1,651.68 and 407.72

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Solution

The fourth proportional to 1,101.18, 1,651.68 and 407.72 is: 611.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.18 : 1,651.68 = 407.72 : x
  2. Step 2: Convert to fraction form
    1,101.18/1,651.68 = 407.72/x
  3. Step 3: Cross multiply
    1,101.18x = 1,651.68 × 407.72
  4. Step 4: Simplify right side
    1,101.18x = 673,415.73
  5. Step 5: Solve for x
    x = 673,415.73/1,101.18
  6. Step 6: Final answer
    x = 611.54

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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.