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Finding the Fourth Proportional to 1,380.36, 1,904.30 and 882.12

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Solution

The fourth proportional to 1,380.36, 1,904.30 and 882.12 is: 1,216.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.36 : 1,904.30 = 882.12 : x
  2. Step 2: Convert to fraction form
    1,380.36/1,904.30 = 882.12/x
  3. Step 3: Cross multiply
    1,380.36x = 1,904.30 × 882.12
  4. Step 4: Simplify right side
    1,380.36x = 1,679,821.12
  5. Step 5: Solve for x
    x = 1,679,821.12/1,380.36
  6. Step 6: Final answer
    x = 1,216.94

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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.