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Finding the Fourth Proportional to 939.64, 1,298.13 and 801.19

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Solution

The fourth proportional to 939.64, 1,298.13 and 801.19 is: 1,106.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.64 : 1,298.13 = 801.19 : x
  2. Step 2: Convert to fraction form
    939.64/1,298.13 = 801.19/x
  3. Step 3: Cross multiply
    939.64x = 1,298.13 × 801.19
  4. Step 4: Simplify right side
    939.64x = 1,040,048.77
  5. Step 5: Solve for x
    x = 1,040,048.77/939.64
  6. Step 6: Final answer
    x = 1,106.86

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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.