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Finding the Fourth Proportional to 1,395.38, 1,925.66 and 765.96

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Solution

The fourth proportional to 1,395.38, 1,925.66 and 765.96 is: 1,057.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.38 : 1,925.66 = 765.96 : x
  2. Step 2: Convert to fraction form
    1,395.38/1,925.66 = 765.96/x
  3. Step 3: Cross multiply
    1,395.38x = 1,925.66 × 765.96
  4. Step 4: Simplify right side
    1,395.38x = 1,474,978.53
  5. Step 5: Solve for x
    x = 1,474,978.53/1,395.38
  6. Step 6: Final answer
    x = 1,057.04

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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.