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Finding the Fourth Proportional to 1,329.85, 1,992.75 and 913.11

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Solution

The fourth proportional to 1,329.85, 1,992.75 and 913.11 is: 1,368.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.85 : 1,992.75 = 913.11 : x
  2. Step 2: Convert to fraction form
    1,329.85/1,992.75 = 913.11/x
  3. Step 3: Cross multiply
    1,329.85x = 1,992.75 × 913.11
  4. Step 4: Simplify right side
    1,329.85x = 1,819,599.95
  5. Step 5: Solve for x
    x = 1,819,599.95/1,329.85
  6. Step 6: Final answer
    x = 1,368.27

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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.