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Finding the Fourth Proportional to 1,230.08, 1,696.80 and 764

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Solution

The fourth proportional to 1,230.08, 1,696.80 and 764 is: 1,053.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.08 : 1,696.80 = 764 : x
  2. Step 2: Convert to fraction form
    1,230.08/1,696.80 = 764/x
  3. Step 3: Cross multiply
    1,230.08x = 1,696.80 × 764
  4. Step 4: Simplify right side
    1,230.08x = 1,296,355.20
  5. Step 5: Solve for x
    x = 1,296,355.20/1,230.08
  6. Step 6: Final answer
    x = 1,053.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.