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Finding the Fourth Proportional to 772.35, 1,065.87 and 440.79

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Solution

The fourth proportional to 772.35, 1,065.87 and 440.79 is: 608.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.35 : 1,065.87 = 440.79 : x
  2. Step 2: Convert to fraction form
    772.35/1,065.87 = 440.79/x
  3. Step 3: Cross multiply
    772.35x = 1,065.87 × 440.79
  4. Step 4: Simplify right side
    772.35x = 469,824.84
  5. Step 5: Solve for x
    x = 469,824.84/772.35
  6. Step 6: Final answer
    x = 608.31

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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.