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Finding the Fourth Proportional to 771.92, 1,065.16 and 457.20

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Solution

The fourth proportional to 771.92, 1,065.16 and 457.20 is: 630.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.92 : 1,065.16 = 457.20 : x
  2. Step 2: Convert to fraction form
    771.92/1,065.16 = 457.20/x
  3. Step 3: Cross multiply
    771.92x = 1,065.16 × 457.20
  4. Step 4: Simplify right side
    771.92x = 486,991.15
  5. Step 5: Solve for x
    x = 486,991.15/771.92
  6. Step 6: Final answer
    x = 630.88

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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.