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Finding the Fourth Proportional to 1,112.12, 1,534.79 and 670.09

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Solution

The fourth proportional to 1,112.12, 1,534.79 and 670.09 is: 924.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.12 : 1,534.79 = 670.09 : x
  2. Step 2: Convert to fraction form
    1,112.12/1,534.79 = 670.09/x
  3. Step 3: Cross multiply
    1,112.12x = 1,534.79 × 670.09
  4. Step 4: Simplify right side
    1,112.12x = 1,028,447.43
  5. Step 5: Solve for x
    x = 1,028,447.43/1,112.12
  6. Step 6: Final answer
    x = 924.76

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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.