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Finding the Fourth Proportional to 1,294.21, 1,785.95 and 704.75

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Solution

The fourth proportional to 1,294.21, 1,785.95 and 704.75 is: 972.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.21 : 1,785.95 = 704.75 : x
  2. Step 2: Convert to fraction form
    1,294.21/1,785.95 = 704.75/x
  3. Step 3: Cross multiply
    1,294.21x = 1,785.95 × 704.75
  4. Step 4: Simplify right side
    1,294.21x = 1,258,639.33
  5. Step 5: Solve for x
    x = 1,258,639.33/1,294.21
  6. Step 6: Final answer
    x = 972.52

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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.