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Finding the Fourth Proportional to 1,354.97, 1,869.95 and 765.29

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Solution

The fourth proportional to 1,354.97, 1,869.95 and 765.29 is: 1,056.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.97 : 1,869.95 = 765.29 : x
  2. Step 2: Convert to fraction form
    1,354.97/1,869.95 = 765.29/x
  3. Step 3: Cross multiply
    1,354.97x = 1,869.95 × 765.29
  4. Step 4: Simplify right side
    1,354.97x = 1,431,054.04
  5. Step 5: Solve for x
    x = 1,431,054.04/1,354.97
  6. Step 6: Final answer
    x = 1,056.15

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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.