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Finding the Fourth Proportional to 1,109.70, 1,663.38 and 451.32

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Solution

The fourth proportional to 1,109.70, 1,663.38 and 451.32 is: 676.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.70 : 1,663.38 = 451.32 : x
  2. Step 2: Convert to fraction form
    1,109.70/1,663.38 = 451.32/x
  3. Step 3: Cross multiply
    1,109.70x = 1,663.38 × 451.32
  4. Step 4: Simplify right side
    1,109.70x = 750,716.66
  5. Step 5: Solve for x
    x = 750,716.66/1,109.70
  6. Step 6: Final answer
    x = 676.50

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1.5x scale

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.