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Finding the Fourth Proportional to 785.67, 1,084.20 and 505.92

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Solution

The fourth proportional to 785.67, 1,084.20 and 505.92 is: 698.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.67 : 1,084.20 = 505.92 : x
  2. Step 2: Convert to fraction form
    785.67/1,084.20 = 505.92/x
  3. Step 3: Cross multiply
    785.67x = 1,084.20 × 505.92
  4. Step 4: Simplify right side
    785.67x = 548,518.46
  5. Step 5: Solve for x
    x = 548,518.46/785.67
  6. Step 6: Final answer
    x = 698.15

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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.