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Finding the Fourth Proportional to 931.40, 1,396.98 and 444.79

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Solution

The fourth proportional to 931.40, 1,396.98 and 444.79 is: 667.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.40 : 1,396.98 = 444.79 : x
  2. Step 2: Convert to fraction form
    931.40/1,396.98 = 444.79/x
  3. Step 3: Cross multiply
    931.40x = 1,396.98 × 444.79
  4. Step 4: Simplify right side
    931.40x = 621,362.73
  5. Step 5: Solve for x
    x = 621,362.73/931.40
  6. Step 6: Final answer
    x = 667.13

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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.