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Finding the Fourth Proportional to 1,043.21, 1,438.99 and 670.68

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Solution

The fourth proportional to 1,043.21, 1,438.99 and 670.68 is: 925.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.21 : 1,438.99 = 670.68 : x
  2. Step 2: Convert to fraction form
    1,043.21/1,438.99 = 670.68/x
  3. Step 3: Cross multiply
    1,043.21x = 1,438.99 × 670.68
  4. Step 4: Simplify right side
    1,043.21x = 965,100.14
  5. Step 5: Solve for x
    x = 965,100.14/1,043.21
  6. Step 6: Final answer
    x = 925.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.