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Finding the Fourth Proportional to 931.44, 1,396.60 and 383.98

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Solution

The fourth proportional to 931.44, 1,396.60 and 383.98 is: 575.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.44 : 1,396.60 = 383.98 : x
  2. Step 2: Convert to fraction form
    931.44/1,396.60 = 383.98/x
  3. Step 3: Cross multiply
    931.44x = 1,396.60 × 383.98
  4. Step 4: Simplify right side
    931.44x = 536,266.47
  5. Step 5: Solve for x
    x = 536,266.47/931.44
  6. Step 6: Final answer
    x = 575.74

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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.