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Finding the Fourth Proportional to 1,354.93, 1,869.91 and 765.57

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Solution

The fourth proportional to 1,354.93, 1,869.91 and 765.57 is: 1,056.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.93 : 1,869.91 = 765.57 : x
  2. Step 2: Convert to fraction form
    1,354.93/1,869.91 = 765.57/x
  3. Step 3: Cross multiply
    1,354.93x = 1,869.91 × 765.57
  4. Step 4: Simplify right side
    1,354.93x = 1,431,537.65
  5. Step 5: Solve for x
    x = 1,431,537.65/1,354.93
  6. Step 6: Final answer
    x = 1,056.54

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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.