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Finding the Fourth Proportional to 1,387, 1,914.08 and 766

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Solution

The fourth proportional to 1,387, 1,914.08 and 766 is: 1,057.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 1,914.08 = 766 : x
  2. Step 2: Convert to fraction form
    1,387/1,914.08 = 766/x
  3. Step 3: Cross multiply
    1,387x = 1,914.08 × 766
  4. Step 4: Simplify right side
    1,387x = 1,466,185.28
  5. Step 5: Solve for x
    x = 1,466,185.28/1,387
  6. Step 6: Final answer
    x = 1,057.09

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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.