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Finding the Fourth Proportional to 771.77, 1,065.04 and 440.20

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Solution

The fourth proportional to 771.77, 1,065.04 and 440.20 is: 607.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.77 : 1,065.04 = 440.20 : x
  2. Step 2: Convert to fraction form
    771.77/1,065.04 = 440.20/x
  3. Step 3: Cross multiply
    771.77x = 1,065.04 × 440.20
  4. Step 4: Simplify right side
    771.77x = 468,830.61
  5. Step 5: Solve for x
    x = 468,830.61/771.77
  6. Step 6: Final answer
    x = 607.48

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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.