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Finding the Fourth Proportional to 1,354.49, 1,869.27 and 765.08

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Solution

The fourth proportional to 1,354.49, 1,869.27 and 765.08 is: 1,055.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.49 : 1,869.27 = 765.08 : x
  2. Step 2: Convert to fraction form
    1,354.49/1,869.27 = 765.08/x
  3. Step 3: Cross multiply
    1,354.49x = 1,869.27 × 765.08
  4. Step 4: Simplify right side
    1,354.49x = 1,430,131.75
  5. Step 5: Solve for x
    x = 1,430,131.75/1,354.49
  6. Step 6: Final answer
    x = 1,055.85

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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.