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Finding the Fourth Proportional to 788.12, 1,087.26 and 477.56

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Solution

The fourth proportional to 788.12, 1,087.26 and 477.56 is: 658.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.12 : 1,087.26 = 477.56 : x
  2. Step 2: Convert to fraction form
    788.12/1,087.26 = 477.56/x
  3. Step 3: Cross multiply
    788.12x = 1,087.26 × 477.56
  4. Step 4: Simplify right side
    788.12x = 519,231.89
  5. Step 5: Solve for x
    x = 519,231.89/788.12
  6. Step 6: Final answer
    x = 658.82

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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.