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Finding the Fourth Proportional to 931.28, 1,396.93 and 314.99

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Solution

The fourth proportional to 931.28, 1,396.93 and 314.99 is: 472.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.28 : 1,396.93 = 314.99 : x
  2. Step 2: Convert to fraction form
    931.28/1,396.93 = 314.99/x
  3. Step 3: Cross multiply
    931.28x = 1,396.93 × 314.99
  4. Step 4: Simplify right side
    931.28x = 440,017.41
  5. Step 5: Solve for x
    x = 440,017.41/931.28
  6. Step 6: Final answer
    x = 472.49

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Double scale
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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.