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Finding the Fourth Proportional to 772.35, 1,065.86 and 423.03

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Solution

The fourth proportional to 772.35, 1,065.86 and 423.03 is: 583.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.35 : 1,065.86 = 423.03 : x
  2. Step 2: Convert to fraction form
    772.35/1,065.86 = 423.03/x
  3. Step 3: Cross multiply
    772.35x = 1,065.86 × 423.03
  4. Step 4: Simplify right side
    772.35x = 450,890.76
  5. Step 5: Solve for x
    x = 450,890.76/772.35
  6. Step 6: Final answer
    x = 583.79

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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.