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Finding the Fourth Proportional to 1,207.68, 1,665.96 and 764.82

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Solution

The fourth proportional to 1,207.68, 1,665.96 and 764.82 is: 1,055.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.68 : 1,665.96 = 764.82 : x
  2. Step 2: Convert to fraction form
    1,207.68/1,665.96 = 764.82/x
  3. Step 3: Cross multiply
    1,207.68x = 1,665.96 × 764.82
  4. Step 4: Simplify right side
    1,207.68x = 1,274,159.53
  5. Step 5: Solve for x
    x = 1,274,159.53/1,207.68
  6. Step 6: Final answer
    x = 1,055.05

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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.