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Finding the Fourth Proportional to 771.95, 1,065.40 and 440.41

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Solution

The fourth proportional to 771.95, 1,065.40 and 440.41 is: 607.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.95 : 1,065.40 = 440.41 : x
  2. Step 2: Convert to fraction form
    771.95/1,065.40 = 440.41/x
  3. Step 3: Cross multiply
    771.95x = 1,065.40 × 440.41
  4. Step 4: Simplify right side
    771.95x = 469,212.81
  5. Step 5: Solve for x
    x = 469,212.81/771.95
  6. Step 6: Final answer
    x = 607.83

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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.