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Finding the Fourth Proportional to 1,288.41, 1,932.31 and 410.67

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Solution

The fourth proportional to 1,288.41, 1,932.31 and 410.67 is: 615.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.41 : 1,932.31 = 410.67 : x
  2. Step 2: Convert to fraction form
    1,288.41/1,932.31 = 410.67/x
  3. Step 3: Cross multiply
    1,288.41x = 1,932.31 × 410.67
  4. Step 4: Simplify right side
    1,288.41x = 793,539.95
  5. Step 5: Solve for x
    x = 793,539.95/1,288.41
  6. Step 6: Final answer
    x = 615.91

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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.