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Finding the Fourth Proportional to 771.97, 1,065.14 and 457.07

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Solution

The fourth proportional to 771.97, 1,065.14 and 457.07 is: 630.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.97 : 1,065.14 = 457.07 : x
  2. Step 2: Convert to fraction form
    771.97/1,065.14 = 457.07/x
  3. Step 3: Cross multiply
    771.97x = 1,065.14 × 457.07
  4. Step 4: Simplify right side
    771.97x = 486,843.54
  5. Step 5: Solve for x
    x = 486,843.54/771.97
  6. Step 6: Final answer
    x = 630.65

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1.5x scale

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.