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Finding the Fourth Proportional to 772.60, 1,065.56 and 679.14

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Solution

The fourth proportional to 772.60, 1,065.56 and 679.14 is: 936.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.60 : 1,065.56 = 679.14 : x
  2. Step 2: Convert to fraction form
    772.60/1,065.56 = 679.14/x
  3. Step 3: Cross multiply
    772.60x = 1,065.56 × 679.14
  4. Step 4: Simplify right side
    772.60x = 723,669.75
  5. Step 5: Solve for x
    x = 723,669.75/772.60
  6. Step 6: Final answer
    x = 936.67

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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.