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Finding the Fourth Proportional to 1,354.85, 1,869.65 and 765.36

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Solution

The fourth proportional to 1,354.85, 1,869.65 and 765.36 is: 1,056.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.85 : 1,869.65 = 765.36 : x
  2. Step 2: Convert to fraction form
    1,354.85/1,869.65 = 765.36/x
  3. Step 3: Cross multiply
    1,354.85x = 1,869.65 × 765.36
  4. Step 4: Simplify right side
    1,354.85x = 1,430,951.50
  5. Step 5: Solve for x
    x = 1,430,951.50/1,354.85
  6. Step 6: Final answer
    x = 1,056.17

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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.