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Finding the Fourth Proportional to 771.76, 1,065.01 and 440.30

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Solution

The fourth proportional to 771.76, 1,065.01 and 440.30 is: 607.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.76 : 1,065.01 = 440.30 : x
  2. Step 2: Convert to fraction form
    771.76/1,065.01 = 440.30/x
  3. Step 3: Cross multiply
    771.76x = 1,065.01 × 440.30
  4. Step 4: Simplify right side
    771.76x = 468,923.90
  5. Step 5: Solve for x
    x = 468,923.90/771.76
  6. Step 6: Final answer
    x = 607.60

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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.