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Finding the Fourth Proportional to 1,354.91, 1,869.80 and 765.49

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Solution

The fourth proportional to 1,354.91, 1,869.80 and 765.49 is: 1,056.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.91 : 1,869.80 = 765.49 : x
  2. Step 2: Convert to fraction form
    1,354.91/1,869.80 = 765.49/x
  3. Step 3: Cross multiply
    1,354.91x = 1,869.80 × 765.49
  4. Step 4: Simplify right side
    1,354.91x = 1,431,313.20
  5. Step 5: Solve for x
    x = 1,431,313.20/1,354.91
  6. Step 6: Final answer
    x = 1,056.39

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1.5x scale

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.