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Finding the Fourth Proportional to 1,317.21, 1,975.01 and 769.11

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Solution

The fourth proportional to 1,317.21, 1,975.01 and 769.11 is: 1,153.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.21 : 1,975.01 = 769.11 : x
  2. Step 2: Convert to fraction form
    1,317.21/1,975.01 = 769.11/x
  3. Step 3: Cross multiply
    1,317.21x = 1,975.01 × 769.11
  4. Step 4: Simplify right side
    1,317.21x = 1,518,996.10
  5. Step 5: Solve for x
    x = 1,518,996.10/1,317.21
  6. Step 6: Final answer
    x = 1,153.19

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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.