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Finding the Fourth Proportional to 936.96, 1,289.76 and 810.87

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Solution

The fourth proportional to 936.96, 1,289.76 and 810.87 is: 1,116.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.96 : 1,289.76 = 810.87 : x
  2. Step 2: Convert to fraction form
    936.96/1,289.76 = 810.87/x
  3. Step 3: Cross multiply
    936.96x = 1,289.76 × 810.87
  4. Step 4: Simplify right side
    936.96x = 1,045,827.69
  5. Step 5: Solve for x
    x = 1,045,827.69/936.96
  6. Step 6: Final answer
    x = 1,116.19

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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.