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Finding the Fourth Proportional to 782.08, 1,170.88 and 620

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Solution

The fourth proportional to 782.08, 1,170.88 and 620 is: 928.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.08 : 1,170.88 = 620 : x
  2. Step 2: Convert to fraction form
    782.08/1,170.88 = 620/x
  3. Step 3: Cross multiply
    782.08x = 1,170.88 × 620
  4. Step 4: Simplify right side
    782.08x = 725,945.60
  5. Step 5: Solve for x
    x = 725,945.60/782.08
  6. Step 6: Final answer
    x = 928.22

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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.