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Finding the Fourth Proportional to 1,387, 1,914.18 and 766.12

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Solution

The fourth proportional to 1,387, 1,914.18 and 766.12 is: 1,057.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387 : 1,914.18 = 766.12 : x
  2. Step 2: Convert to fraction form
    1,387/1,914.18 = 766.12/x
  3. Step 3: Cross multiply
    1,387x = 1,914.18 × 766.12
  4. Step 4: Simplify right side
    1,387x = 1,466,491.58
  5. Step 5: Solve for x
    x = 1,466,491.58/1,387
  6. Step 6: Final answer
    x = 1,057.31

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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.