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Finding the Fourth Proportional to 1,291.97, 1,936.78 and 470.06

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Solution

The fourth proportional to 1,291.97, 1,936.78 and 470.06 is: 704.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.97 : 1,936.78 = 470.06 : x
  2. Step 2: Convert to fraction form
    1,291.97/1,936.78 = 470.06/x
  3. Step 3: Cross multiply
    1,291.97x = 1,936.78 × 470.06
  4. Step 4: Simplify right side
    1,291.97x = 910,410.11
  5. Step 5: Solve for x
    x = 910,410.11/1,291.97
  6. Step 6: Final answer
    x = 704.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.