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Finding the Fourth Proportional to 772.31, 1,063.61 and 703.11

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Solution

The fourth proportional to 772.31, 1,063.61 and 703.11 is: 968.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.31 : 1,063.61 = 703.11 : x
  2. Step 2: Convert to fraction form
    772.31/1,063.61 = 703.11/x
  3. Step 3: Cross multiply
    772.31x = 1,063.61 × 703.11
  4. Step 4: Simplify right side
    772.31x = 747,826.99
  5. Step 5: Solve for x
    x = 747,826.99/772.31
  6. Step 6: Final answer
    x = 968.30

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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.