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Finding the Fourth Proportional to 936.69, 1,302.96 and 918.87

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Solution

The fourth proportional to 936.69, 1,302.96 and 918.87 is: 1,278.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.69 : 1,302.96 = 918.87 : x
  2. Step 2: Convert to fraction form
    936.69/1,302.96 = 918.87/x
  3. Step 3: Cross multiply
    936.69x = 1,302.96 × 918.87
  4. Step 4: Simplify right side
    936.69x = 1,197,250.86
  5. Step 5: Solve for x
    x = 1,197,250.86/936.69
  6. Step 6: Final answer
    x = 1,278.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.