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Finding the Fourth Proportional to 772.83, 1,160.15 and 620.64

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Solution

The fourth proportional to 772.83, 1,160.15 and 620.64 is: 931.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.83 : 1,160.15 = 620.64 : x
  2. Step 2: Convert to fraction form
    772.83/1,160.15 = 620.64/x
  3. Step 3: Cross multiply
    772.83x = 1,160.15 × 620.64
  4. Step 4: Simplify right side
    772.83x = 720,032.39
  5. Step 5: Solve for x
    x = 720,032.39/772.83
  6. Step 6: Final answer
    x = 931.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.