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Finding the Fourth Proportional to 772.06, 1,065.81 and 457.21

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Solution

The fourth proportional to 772.06, 1,065.81 and 457.21 is: 631.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.06 : 1,065.81 = 457.21 : x
  2. Step 2: Convert to fraction form
    772.06/1,065.81 = 457.21/x
  3. Step 3: Cross multiply
    772.06x = 1,065.81 × 457.21
  4. Step 4: Simplify right side
    772.06x = 487,298.99
  5. Step 5: Solve for x
    x = 487,298.99/772.06
  6. Step 6: Final answer
    x = 631.17

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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.