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Finding the Fourth Proportional to 939.96, 1,296.48 and 808.74

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Solution

The fourth proportional to 939.96, 1,296.48 and 808.74 is: 1,115.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.96 : 1,296.48 = 808.74 : x
  2. Step 2: Convert to fraction form
    939.96/1,296.48 = 808.74/x
  3. Step 3: Cross multiply
    939.96x = 1,296.48 × 808.74
  4. Step 4: Simplify right side
    939.96x = 1,048,515.24
  5. Step 5: Solve for x
    x = 1,048,515.24/939.96
  6. Step 6: Final answer
    x = 1,115.49

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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.