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Finding the Fourth Proportional to 931.30, 1,394.21 and 670.38

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Solution

The fourth proportional to 931.30, 1,394.21 and 670.38 is: 1,003.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.30 : 1,394.21 = 670.38 : x
  2. Step 2: Convert to fraction form
    931.30/1,394.21 = 670.38/x
  3. Step 3: Cross multiply
    931.30x = 1,394.21 × 670.38
  4. Step 4: Simplify right side
    931.30x = 934,646.95
  5. Step 5: Solve for x
    x = 934,646.95/931.30
  6. Step 6: Final answer
    x = 1,003.60

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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.