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Finding the Fourth Proportional to 894.69, 1,236.15 and 645.51

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Solution

The fourth proportional to 894.69, 1,236.15 and 645.51 is: 891.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    894.69 : 1,236.15 = 645.51 : x
  2. Step 2: Convert to fraction form
    894.69/1,236.15 = 645.51/x
  3. Step 3: Cross multiply
    894.69x = 1,236.15 × 645.51
  4. Step 4: Simplify right side
    894.69x = 797,947.19
  5. Step 5: Solve for x
    x = 797,947.19/894.69
  6. Step 6: Final answer
    x = 891.87

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Double scale
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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.