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Finding the Fourth Proportional to 931.44, 1,393.92 and 786.72

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Solution

The fourth proportional to 931.44, 1,393.92 and 786.72 is: 1,177.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.44 : 1,393.92 = 786.72 : x
  2. Step 2: Convert to fraction form
    931.44/1,393.92 = 786.72/x
  3. Step 3: Cross multiply
    931.44x = 1,393.92 × 786.72
  4. Step 4: Simplify right side
    931.44x = 1,096,624.74
  5. Step 5: Solve for x
    x = 1,096,624.74/931.44
  6. Step 6: Final answer
    x = 1,177.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.