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Finding the Fourth Proportional to 789.55, 1,185.53 and 425.05

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Solution

The fourth proportional to 789.55, 1,185.53 and 425.05 is: 638.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.55 : 1,185.53 = 425.05 : x
  2. Step 2: Convert to fraction form
    789.55/1,185.53 = 425.05/x
  3. Step 3: Cross multiply
    789.55x = 1,185.53 × 425.05
  4. Step 4: Simplify right side
    789.55x = 503,909.53
  5. Step 5: Solve for x
    x = 503,909.53/789.55
  6. Step 6: Final answer
    x = 638.22

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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.