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Finding the Fourth Proportional to 931.90, 1,396.31 and 657.41

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Solution

The fourth proportional to 931.90, 1,396.31 and 657.41 is: 985.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.90 : 1,396.31 = 657.41 : x
  2. Step 2: Convert to fraction form
    931.90/1,396.31 = 657.41/x
  3. Step 3: Cross multiply
    931.90x = 1,396.31 × 657.41
  4. Step 4: Simplify right side
    931.90x = 917,948.16
  5. Step 5: Solve for x
    x = 917,948.16/931.90
  6. Step 6: Final answer
    x = 985.03

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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.