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Finding the Fourth Proportional to 1,015.74, 1,393.15 and 939.20

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Solution

The fourth proportional to 1,015.74, 1,393.15 and 939.20 is: 1,288.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.74 : 1,393.15 = 939.20 : x
  2. Step 2: Convert to fraction form
    1,015.74/1,393.15 = 939.20/x
  3. Step 3: Cross multiply
    1,015.74x = 1,393.15 × 939.20
  4. Step 4: Simplify right side
    1,015.74x = 1,308,438.93
  5. Step 5: Solve for x
    x = 1,308,438.93/1,015.74
  6. Step 6: Final answer
    x = 1,288.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.