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Finding the Fourth Proportional to 772.02, 1,065.39 and 440.45

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Solution

The fourth proportional to 772.02, 1,065.39 and 440.45 is: 607.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.02 : 1,065.39 = 440.45 : x
  2. Step 2: Convert to fraction form
    772.02/1,065.39 = 440.45/x
  3. Step 3: Cross multiply
    772.02x = 1,065.39 × 440.45
  4. Step 4: Simplify right side
    772.02x = 469,245.70
  5. Step 5: Solve for x
    x = 469,245.70/772.02
  6. Step 6: Final answer
    x = 607.82

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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.