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Finding the Fourth Proportional to 1,172.16, 1,758.96 and 686.16

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Solution

The fourth proportional to 1,172.16, 1,758.96 and 686.16 is: 1,029.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.16 : 1,758.96 = 686.16 : x
  2. Step 2: Convert to fraction form
    1,172.16/1,758.96 = 686.16/x
  3. Step 3: Cross multiply
    1,172.16x = 1,758.96 × 686.16
  4. Step 4: Simplify right side
    1,172.16x = 1,206,927.99
  5. Step 5: Solve for x
    x = 1,206,927.99/1,172.16
  6. Step 6: Final answer
    x = 1,029.66

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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.